While I did manage to find one good blue one during the beta, I feel that infectors were the weakest guns of all.
Especially with the small clips and non existant bulltet damages that have a 20% chance to sprout a bug. While im assuming the rarest of them would be quite op, the regular ones are hardly worth using. However I still love the idea and will stick with a rare infector during the real game, and a green automatic grenade launcher of doom as my secondary. What's your thought on infectors? Also, I think I was the only one to use them in pvp as they are quite effective against snipers.