you kidding? if you're trying 2 not say that ME2 isn't an RPG you're retarded. that's like saying final fantasy isn't a RPG cause it has lots of action Lol...
RPG generally means in depth storyline and rewards you the more you play with progression via levels, or story line. if you want 2 be specific you can call it a action RPG, but it's still a RPG anyway you clearly cut it.
the amount of action doesn't matter... RPG is RPG.