"Mass Effect has never been about gameplay. It has been about story, characters, relationships and narattion. It also had good gameplay to support that but Mass Effect 3 doesnt change much in terms of gameplay. It brings in its share of upgrades, a huge range of new weapons, a complete class of enemies, but it is all as expected and there are not many surprises here." -
Commander Sheppard is a Character - it's not a 'role' - there's precious little 'role play' involved in the proper gaming sense. I hate to be the one to break this to you but what you are doing is merely manipulating a game Character, not much more.
Now if your saying no computer game is an actual RPG then I agree. Otherwise you are always just "manipulating" a game character and this game is as good, or better, then others.