When I unlocked the Heavy size, I was a little reluctant to try it out at first.
However, I was dying so much (thanks a lot, teammate bots!) that I decided to experiment as a Heavy.
What. A. Difference. Especially if you have a machine-gun thing and assault rifles and good combos like that.
I was playing as a Heavy Medic (and got Battle Hardened and Supply increase) and it was soooooo much fun dominating those pesky enemy AI
who keep trying to flank my teammate AI, lol!

I live much longer now, and I can revive/buff my teammmates on a more consistent basis.
I had a lovely time using the Heavy. ^_^
I rarely used SMART as a Medium, so Light is probably going to be useless for me, hee (especially if
I die faster. Trust me, with these teammate AI, you do NOT want to die faster, heh! :tongue: ).
I had an even lovelier time when I changed the difficult level from Normal to Easy, so maybe the enemy AI is not as ridiculous, lol.
This sounds to me like every player is finding themselves good at different class/size combinations.
I'm very happy to hear that.
Yup, I'm finding pure Medic-class and Heavy size helps me survive the hectic single-player campaign a lot better, lol.