I'm not a multiplayer kind of guy. I used to be, back when Modern Warfare and Gears Of War were the thing.
But since then, I've dropped out. Secluded back to single player videogames, and I haven't regretted it since.
However, Gotham City Impostors is awesome! I've never really felt like I've been completely outclassed or unable to deal with enemies, though the body types certainly do come with different benefits and rewards. It seems to avoid the general multiplayer frustration by always giving you something kooky to laugh at. If it's not the killing shot one-liner that gets you, maybe it's the out-of-place music or hilarious outfits.
Plain and simple: this game is pure fun, and you should play it!