So, this game is basic COD. And as such has all the fun, but also all the downsides of basic COD. Poor hit boxes, movement gimmicks, and gun stats that make no sense leading to meta builds. But there's more! Not only does it have all those old, tired, broken basic COD features but they brought back a concept from the ill-fated Mercs vs Spies multiplayer from the old Splinter Cell.
In other words, if you aren't running Echelon with the wall hax/UAV sonar ability then you are instead nameless merc number whatever getting popped from behind by a wall haxs Echelon. Seriously. If you get in a match and the team has more then two Echelon, you are better off just leaving the match unless you enjoy constantly being shot in the back as they spam their sonar like they're submarines.
But hey, the game is free. And if they ever work out making all the guns viable and nerf the ever-loving day lights out of the Echelon class, the game could last more than a few months before everyone gets bored and moves on. Also a hardcore mode would be nice.