We've been over this, but you consider the gameplay of ME to be mediocre because you've always approached it as a shooter. I've always approached it as an RPG and have highly enjoyed the tactical options available to me. But it's far from perfect. Starting with ME 2 and going into ME 3, BioWare just doesn't have great level design for the shooting they want to implement. ME 2 was just like the first Gears game in the sense that you could always tell when a fight was going to start because of all the convenient waist-high cover points that would show up. ME 2 also was basically a game of "run forward, shoot, run forward, shoot, cutscene", and ME 3 seems to be the same thing.
My problems with ME 3 so far have been narrative related, but you're spot on about the framerate. Even the cutscenes have jarring, janky animation and surprisingly poor lip syncing. But I'll give the game props for giving me a little more RPG mechanic. So far, the powers seem weak, but I'm hoping as I level they reach the fabled craziness of the first game. Still bummed about the lack of inventory and the way its managed. The idea of only being able to switch out weapons at very certain points is just absurd to me.