A fair concern. In all my attempts, I make sure there is some re-arrangement going atleast and then going for a different sound as a lead to give it a totally different feel. Right now Atari remixes have been gripping my attention, and most of it churning into hardcore and that ilk.
I believe the main goal of a remix should be to change the feel of the song, what once was a gimmicky happy now turned into an aggressive orgasm of sound or a mournful sonnet.
My thoughts.