It's not the games themselves...it's the decisions they force upon the companies finishing the games up.

I.E. the Mass Effect ending. Even though Bioware told us they had Mass Effect 3 story basically under wraps when Mass Effect 2 was in the makes but that ending screams EA had them rush the game. Mass Effect 2 was in the middle of like 2 more DLCs a month or so right before Mass Effect 3. I get it to have the feel of the 2 games happening back to back but from Mass Effect 2 to Mass Effect 3 felt way to short of a time between them. EA influence.