Contrast "this should be done better" against "this should be done Mor Better". The intention, I think, is to be less abrasive and "something else". Really I'm not even sure how to describe it, which I think is actually why people use such formulations; it does add at least some connotative meaning which is hard to express explicitly.

Basically, I do find it "additive", but it's obviously only feasible in very informal contexts and the percentage of the audience for whom it is not additive (and possibly quite jarring) might be quite high.