Correct me if im wrong but it seems like resistance 2 online has only a few guns to choose from! I myself only really use the carbine and the marksman (and occasionally the wraith because i like that weapon) compared to some online games the weapon variety seems lacking what do you think???

I think Insomniac decided that this is a new franchise and not to follow the Ratchet & Clank formula of as many crazy weapons as reasonably possible.  Just that.

Auger, Magnum, Bullseye, Fareye, Marksman, Carbine, Bellock, Rossmore

Hmmm, I guess your right but no complaints here
I'd rather have one definitive shotgun instead of thirty different weird variants
Plus the secondary fire keeps guns like the Bullseye and Carbine from being the same

I think the amount of weapons is fine. They've got a few heavy weapons, they only need 1 pistol, a few long range weapons and a couple of short range weapons (bullseye + carbine). I don't think they need anymore although they COULD throw in like 5 pistols, 6 semi-automatics etc...which isn't really needed.