Mass Effect 3 is an action junk game that is nothing more than a means to entertain peoples virtual love interests. The writing is cheap Hollywood junk, the mechanics of the game are a cheap arcade thriller and the development and decision system is like a road that splits and turns back in on itself. The original may have been a good start, but they went down hill after. Nothing wrong with you liking it, but liking it doesn't make it quality.
And you not liking doesn't make it less quality. I think the writing is decent, the mechanics fun, the decisions engaging. Now what? Opinions, opnions...
Don't mistake opinions for facts.
But yes, Mass Effect is indeed an "action" game. Nobody denied that. There is nothing wrong with making an action game. But haters gonna hate anyway.