A very well polished arena-based 3D fighting game with lots of variation due to the classes being unique and useful on their own, flawed however by a steep learning curve that not many will bother to attempt. If you are going to perservere, your partience is going to get rewarded. Or else, you're going down in no time.
Forge is a fighting game that is highly reminiscent of games like World of Warcraft, for the pvp aspect and the skills you have, and also a MOBA due to the classes being unique and being very well thought out, so much that it's sadly common to never have wardens or proper tinkers. The amount of detail on each class is very noticeable and you'll enjoy experiment each one of them, eventually focusing on only one: I spent most of my gametime playing one class, and I still haven't mastered it completely and I always found new things to learn. Definitely, that alone is a great thing. In addition each arena is big and you're also able to wall jump away, a very well common tactic in a lot of fights to escape the enemy. Too bad the maps are too few.
If anything, the flaws comes out when you play the game itself, in particular the class setup: I hardly saw wardens around and most of the times it was pathfinders, pyromancers and assassins. Yes, no shaman either, or tinker or ravager: that alone makes each team so hard to variate and a lot of times if your team has no shaman, you can die if your enemy does.
In addition a lot of people complain that some classes are useless, like the warden, while I actually saw several owning the battlefield, since "I" was healing it and helping him: in a way, she was like the heavy from TF2, meaning that without support she dies, as well as the other classes, like a true team based game. And here's the problem: it's a team based game, and as such you'll have to rely on your team to win...and as we all know nowadays people pretend to be one-man army all of the sudden and skip other classes for the easiest one. As much as I can't blame them, at the same time it's also why the game is very shallow at times.
And let's not forget the big issue...a lot of people complain that this game is hard and so they quit it. Well, like I said in my short version the game has a learning curve, as you have 9 skills and most of them can be glyphed to make their effects work differently. You can't expect simple commands here and you'll need to practice the more you play, and is sad because that's what makes this game fun.
In addition the game is NOT Pay-To-Win and the only items you buy are armor and boosters for experience, and levels only makes you able to unlock glyphs and change the stats of your character (which don't make the class overpowered, but just fit your needs). And the game has a huge lack of players which is really sad, but the game has a solid community of players (and haters too), so I highly recommend to try this game.
I do not recommend if you don't like fighting games, arena-fighting games and in general don't want a team-based game.