I think 99% of the remixes are unlistenable. I get annoyed when they pack the reissues with remixes like they are giving us something worthwhile, when really they're just filler.
I will say that I prefer the version of "If Good Will Send His Angels" w/the alternate lyrics on the City of Angels soundtrack, along with the soundtrack version of Winter. I also prefer the new mixes of the Pop songs on the 90/00 compilation albums (yeah I know, blasphemy). Not sure if any of those are proper remixes though or just alternate/new versions of the songs.
The first 40 seconds of the New Year's Day (USA Remix) is kind of cool.
Aside from those, for the most part I think all other U2 remixes pretty much suck. I've never heard one I wanted to hear more than once (usually regretted listening the first time).
The remixes, however, do have one positive attribute: they make me appreciate the originals more.