If Mass Effect 2 is an RPG..

[SnesTea]

ishiki said:

I don't get labels really.

Well it probably is an RPG or a game with rpg elements (which imo makes it an rpg  :P)... I haven't played red dead. But San Andreas had RPG elements as does Peace Walker. Both games not generally considered RPG.

Another example in a different way is Deus Ex a FPS with RPG elements (And really unique elements at that) But it's generally called atleast on VGC an RPG even though it is a FPS.

Is there an exact definition that's generally accepted? Or is it just what people use to label certain things.

Yes but San Andreas was perfect. Hell, I would label it as "the best game of all time" genre.