My favorite is the Assassin, which I expected cause I love the Spy in TF2. Assault is my second favorite.

I like Assassin and Gunner, I have customed them both, totally different gameplay styles and both totally fun!

it's a G for me 
 
my favorite class is english class (:

assassin, assault, and gunner are the 3 i use the most(and according to the poll, are also the most used).

Either assault or assassin. It's kind of weird that I didn't enjoy spy in TF2 but I like assassin a whole lot in MNC.

Assassin only if Im the only person using her. If not, Gunner.

Tank beats everything.

Definitely the assault, seems to be all around the best class in the game for my tastes.  Love the grenade launcher and the grapple/charge stuff :)

I'm digging support, it combines two of my favorite TF2 classes. Although, I keep forgetting to hack friendly turrets. :(

" @akamu: I have horny dreams about my teacher. "

I liked the Assasin when I played a quick match. She's all fast and can turn invisible which is always fun!

Hell yeah, just went 12-6-1 with my assault xD. nerd happiness :P

I'm liking most classes. Recently started playing as Tank and DUDE that guy is awesome! I went 38-4-5 earlier.

I have the most fun as the Assassin and Support but I'll play as whoever my teammates don't choose.

Spending most of my time playing as the Gunner. It has helped me get my best game of 37 kills and 12 deaths. And nice having two counters when it comes to close encounters. Nothing like flattening an assassin. Plus side, I don't use the Turret mode so I can save the cash towards spawning bots and juice. 

Gunner

I actually like all of them, except for the sniper, but that's because I suck at sniping. But if I had to pick one, I guess it would probably be either assault or support.