(I'm listening to the 'Magnificent' remixes on YouTube. So far they're ok. The Pete Tong remix is the best so far. This Adam K and SOHA mix is pretty decent. I didn't like the Fred Falke remix -- booooring!)
(I agree that most are unnecessary. But sometimes one comes along that is just awesome and takes the song to a whole other level. The Quincy & Sonace remix of 'Beautiful Day' was like that. And the Armand Van Helden mix of Tori Amos' 'Professional Widow' was definitely like that. I like remixes that have their own personality and originality, and not just the song put to a dance beat with a few techno synths thrown in for good measure. Lame!)
(I did like the ABOY remix but a remix like Rhianna's "Umbrella" where they made it too long and threw in this extra rap line that had nothing to do with the song, pointless)