I used to like the Frankensteins too, for the reasons already stated, but good grief, do they get annoying in Rape Mode after a while! Without Christmas Girl by your side to tell you where their weak point is, you may have to waste an entire magazine to find out. Sometimes I'm almost sure the weak point is scripted to be in the last thing you shoot.
I like the wasps too, just not when they're the last remaining enemy in a large Rape Mode stage and you have to run around and look for them for minutes because you can't see or hear them unless they're close. In any case, I like those Revelations 2 monsters a lot more than those from RE5 or 6, because they're all different and unique, not just boring walking piles of tentacles or unpredictable mutations.