I might could get converted to Exhalted, but the only reason I can thing of to change over is for the setting, which hasn't gotten me excited.
The real problem is that I don't buy games for settings. When the setting becomes the core of the game, I think I've failed as a gm. I almost always make up a setting myself. There are some games where the setting and the system really do go hand in hand, like Chosen (which had a crap system, but COULD have worked for the cool setting), or Paranoia, but these are not frequent. I would play Decipher's LotR game in a custom setting, just like I do d20, I'd play B5 in a custom SF setting.
One major exception I'm making for an upcoming campaign is my M&M game does take place in the published setting. But that's ... well, I can't go further. Sufficeth to say that it won't be a standard use of it.
This is, however, why I like Avalanche products so much. They have good setting ideas, but the ideas can be lifted out and ported without any changes at all. And their historical research is pretty good, so if I *do* want to do a Viking game, or a 17-18th century pirate game, well, Here's a nice source.