Pro Multiple ways to approach a mission
Metal Gear Solid V gives players multiple choices on how to approach a mission or clear an outpost.
For example, the player can choose to use stealth and cunning in order to complete their mission and kill only when it's absolutely necessary, or they can get in guns blazing and kill every single enemy soldier sometimes even sniping each one of them from afar or calling the helicopter for air support.
This gives a special flavor to the gameplay and doesn't let it get stale for a long time since it leaves the choice on how to play to the player, without penalizing them for not completing a mission by using stealth (as other previous MGS used to do).
Pro Allows players to create their private military company
Throughout the story of the game, the player will be trying to rebuild their private military which was lost in the epilogue of the previous title in the MGS series.
Other than building their "Mother Base" which is an ever-evolving giant structure which serves as a base of operations for the player and other NPCs which help the player, players can also recruit enemy soldiers to increase the size of their mercenary company. These soldiers can help based on their area of expertise to either work on developing new projects or be dispatched around the world to complete missions and earn in-game money.
Pro Freedom in approaching a mission
Metal Gear Solid V gives players multiple choices on how to approach a mission.
You can choose to use stealth, taking out enemies only when it's absolutely necessary. You can run in guns blazing, killing everyone on sight. You can get on a high vantage point and take out everyone with a sniper rifle. Or you can call in air support to do all the work for you.
The choice is up to you and the game doesn't penalize you for sticking to a single way. This helps keep the gameplay fresh for a long time.
Pro Enemy AI adapts to your playstyle
The enemy will pick up on your habits and react accordingly. For example, if you use tranq darts to knock enemies out, they will try to wake up their comrades at first. Do this for a couple of missions and they'll immediately run to sound the alarm when they spot someone knocked out. This way the game expertly keeps you out of the comfort zone, having the later missions feel as tense as the first.
Pro Reflex system helps you stay unnoticed
Time will slow down for a short time if you're spotted by an enemy. This allows you to take them out before they can sound the alarm or alert other soldiers. This is quite refreshing compared to other stealth games, where messing up means an immediate end to being stealthy.
Pro Large assortment of weapons and tools
MGS V has a lot of weapons, including pistols, shotguns, machine guns, and sniper rifles. There are both lethal and non-lethal variants, allowing you to find something suitable for any playstyle.
There are also many tools such as the Fulton device, which allows you to capture enemy soldiers and animals, sending them to your base. It's a ton of fun experimenting with new gadgets.
Pro Extremely intelligent AI
As the player levels up gear so will the AI, who are programmed to constantly keep the player on their toes. Being that the whole game is designed to allow the player tackle any level in a multitude of ways, seeing the AI always react differently makes for an original experience every time something is tackled.
Con Micro transactions
Something often found in free to play games is microtransactions, sadly they are included in the multiplayer aspect of The Phantom Pain going so high as $79.99 for a bundle of in game currency that can be used for advantage in the online part of the game. Considering that MGS V already is a full priced title at $59.99, to see Konami milking their fans for never ending microtransactions is pretty disheartening, especially when considering they can be used to get a leg up over others in the multiplayer by easily creating more resources over other non paying players.
Con Micro transactions make multiplayer pay-to-win
You can buy bundles of in-game currency, which can be used to gain an advantage in multiplayer. This makes multiplayer not fun for the players who don't intend on spending extra money. It also makes it boring for the ones who spend the money. Both of these things negatively impact the longevity of the multiplayer.
Some of the bundles go for $79.99, which is more than the game's price. It's sad seeing Konami milk their fans with microtransactions like this.