Recs.
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Pros
Pro Not pay to win
The developers have a strict "no pay to win" mindset in this game, which is great since everyone has a fair chance at winning. Microtransactions are almost exclusively cosmetic, but can also get additional stash tabs (NOT inventory space), non-combat pets and weapon graphics. Note that free accounts already start off with a lot of stash space.
Pro Completely free to download and play
Just install steam and download the game. No purchase required and the only thing locked behind paywalls is cosmetic accessories and inventory slots of which you can waste money on cosmetics, but you won't fall behind if you don't want to spend money.
Pro Expansive skill tree
While it may be difficult to take in at first the skill tree in Path of Exile is quite expansive allowing for many areas of the characters skills to be customized. The tree is so large there are numerous guides online on how to build specific optimized characters as well as an unofficial companion app for Android.
Pro Hundreds of possible character builds
There's a staggering amount of builds and skills you can try out in Path of Exile. There are 7 classes, 19 subclasses, 194 active skill gems, 107 support gems, and over 1000 skill nodes on the expansive skill tree. As a result, there are hundreds of possible combinations, allowing you to spend hours theory-crafting just to create the perfect build. Even if you don't feel like planning out a build from scratch, you can just look up one of the many guides online and get straight into the action.
Pro More customization than any action RPG ever made
The passive tree (more aptly named giant passive web of insanity) has more options with real depth and great customization than any other game. This allows for hundreds or even thousands of potential unique "character builds", especially when combined with the hundreds of unique items (to which they keep adding more regularly)
Pro Feels exhilarating to play
While the gameplay might feel a little slow and clunky in the beginning, it gradually picks up speed as you progress, allowing you to swiftly destroy large groups of monsters with any skills you choose. Whether you're shooting ice arrows with your bow, freezing and shattering every enemy on-screen, or if you're cleaving enemies with a massive axe, causing them to bleed and explode on death, it just feels incredibly satisfying.
Pro Completely free without pay to win mechanics
You can just download and install the game without any purchases. On top of that, there are no pay-to-win mechanics and the only things locked behind paywalls are cosmetic effects, pets, and additional storage space. You can easily play the game for hundreds of hours without spending a dime.
Pro Great setting
Path of Exile is set in a dark fantasy world where everything is gradually becoming worse. At the foreground, you have the massive continent of Wraeclast that once was the home to a flourishing empire, but now is a place filled with the undead, evil spirits, ruins, and echoes of the past. To make matters worse, malicious entities from another dimension seek to corrupt the world and its inhabitants, giving birth to disfigured monstrosities that seek to end you. The end result is an immersive setting with dark motifs, body horror, loads of gore, and a very tense atmosphere, which is refreshing in an era dominated by family friendly content.
Cons
Con Bad trading system
No auction house or gold/item mail, requires direct trade in-game; orb and recipes are not intuitive.
Con As any ARPG worth mentioning, you'll eventually have to invest time into character builds
Con Graphics are a bit stale
While not the worst, the graphics do not really stand out as polished and look somewhat dated. While it does fit within theme of being a grimy universe with many foul creatures, it does not compare to many AAA dungeon crawlers out there such as Diablo III.