When comparing Tom Clancy's Rainbow Six Siege vs XCOM 2, the Slant community recommends XCOM 2 for most people. In the question“What are the best multiplayer games on Steam?” XCOM 2 is ranked 29th while Tom Clancy's Rainbow Six Siege is ranked 41st. The most important reason people chose XCOM 2 is:
One of the main aspects of XCOM 2 is preparing your squad for each mission. You need to consider the terrain, objective, and enemy types. Based on these you'll select the appropriate soldiers, weapons, and gadgets. A lot of the missions have some leeway, so you'll be able to form a squad that fits your playstyle. It can either be a group of stealthy rangers, running in with machetes to surprise the enemy. Or it can be a group sharpshooters, allowing you to systematically clear the area from afar with sniper rifles. After each successful mission/kill your soldiers will earn experience. With enough experience you'll be able to promote them and earn learn new skills. You can also research new weapons and build them. A lot of it comes down to looting alien technology and reverse engineering it back at the base. All these things add up and it's really exciting watching your soldiers grow into unstoppable killing machines.
Specs
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Pros
Pro Great variety of playable classes
You can choose from 10 characters on each side (total of 20) to find the ones that suit your preference, or to explore new, unfamiliar aspects of the gameplay.
As an example, there is Sledge who uses a hammer to break through walls, Flash who can blind the enemy with flash bombs, and Frost who can set up traps to neutralize enemies.
Having such a wide variety of classes not only adds depth to the gameplay, but also keeps it interesting for a long time.
Pro Excellent slow-paced gameplay
Rainbow Six Siege is unlike most modern FPS games. Instead of a super fast, twitch-based gameplay, it focuses on a very slow, methodical, and tactical approach to combat. You'll carefully navigate a building, peeking around every corner, using gadgets to scout out rooms, rappelling on walls, and listening to every sound around you. It's less about just shooting first and more about finding the enemy while staying hidden yourself, which is a refreshing change in the over saturated competitive FPS genre.
Pro Destructible environments make for a lot of fun
Even though you can't raze buildings to the ground, you can make considerable amounts of structural damage to them. You can destroy walls, floors, and various other objects in the environment using gunfire, explosions, or by just slamming something with your weapon. This is a lot of fun, especially when you're new to this game since everything will seem so amazing.
Pro Rival teams have unique objectives and strategies
Rainbow Six Siege makes players' experience truly unique and engaging by giving both teams different perspective, tools, and objectives. Defenders have to hold their ground against enemy who can burst through walls at any moment. They can fortify the base using barricades and barbed wire, reinforcing doors and windows. The Attackers have to strategize, find the weakest spot in opponent's defence.
Pro It's fun to manage your squad
One of the main aspects of XCOM 2 is preparing your squad for each mission. You need to consider the terrain, objective, and enemy types. Based on these you'll select the appropriate soldiers, weapons, and gadgets. A lot of the missions have some leeway, so you'll be able to form a squad that fits your playstyle. It can either be a group of stealthy rangers, running in with machetes to surprise the enemy. Or it can be a group sharpshooters, allowing you to systematically clear the area from afar with sniper rifles.
After each successful mission/kill your soldiers will earn experience. With enough experience you'll be able to promote them and earn learn new skills. You can also research new weapons and build them. A lot of it comes down to looting alien technology and reverse engineering it back at the base.
All these things add up and it's really exciting watching your soldiers grow into unstoppable killing machines.
Pro Makes you feel more for your characters than most character driven games
One of the more fun parts about this game is managing your squad. You can customize the looks, voices, and even names of your soldiers. As you take your soldiers on missions you'll get attached to them. This will create a lot of tense moments when your soldiers are about to die and you desperately try to save them.
If you decide to input the names of your friends or family, multiply the tension by ten.
Pro Excellent suspense
Throughout the campaign you'll always be running against the clock. You have a limited window of time to save humanity before the aliens take over completely. Successful missions only set them back slightly. Unsuccessful missions set you back significantly. It always feels like you're in an uphill struggle and failing means the end. It always feels like you're not gaining an advantage and the aliens have something else in store. This is reinforced in the missions. You never know what type of aliens there will be or what their reinforcements will bring. Encountering new species makes you fear for the well-being of your squad. It's rare for a game to keep you feeling like this.
Cons
Con Ranked play can be discouraging
Not only does Rainbow Six Siege have a very steep learning curve, requiring you to learn map layouts, classes, weapons, and various gadgets, it also has a pretty volatile and demanding community. Even though you can play in ranked matches when you reach level 20, you'll probably get your butt kicked and get promptly flamed by your teammates. This is mostly because of the expectation that you should know everything about the game before you play ranked matches, which is only around the level 60 mark. If you happen to make the mistake of trying them before then, it might leave you with a bad memory that prevents you from wanting to try ranked play again.
Con Lacks single-player content
Rainbow Six Siege is mostly about competitive multiplayer, so it doesn't have a single player campaign, any meaningful storylines, or stuff do alone. If you don't enjoy playing versus other players, Rainbow Six Siege is not the game for you.
Con Demanding on hardware
Will not run on low-end graphics cards like the GeForce GT 740M or the HD Graphics 4600 / 5600.
Con Complaints about the new launcher
Sadly the Steam rating has dropped because of the new launcher, problems can be solved however: XCOM 2 How to Bypass the 2k Launcher without External Files or Configuration Guide.
Con Steep learning curve
XCOM 2 is not just about managing a squad of soldiers, you also have to manage your base and operations on a global scale. This includes managing your resources, identifying which missions you should prioritize, and allocating research for new technologies. It might take a while to learn everything needed to fully enjoy this game, especially on higher difficulties.