I think they work together surprisingly well, considering the rest of the game. Was expecting much more of a mess, but most of the pains I see in the mp (besides the obvious bugs) are simply due to people unlocking more powerful abilities before the counter-abilities are unlocked.
I've been playing since launch, for example (not straight, lmao) and haven't even unlocked any of the Marine armors. I'm almost a level 35, so just like all of the COD crap, some people are just going to have better stuff before others. Not much to do about that, except for adapt accordingly until you can unlock the best counter yourself.