I have to go with Jimfish on this one. Remix parts are usually next to horrible and I think that is the reason most remixes are usually "original" tracks. Most producers claim they like doing remixes mainly because it isn't as much work. I actually find remixes to be more work than writing an original track yourself because now you're stuck with something you HAVE to add.

This subject is also a double edged sword. Who wants to buy a 4 tracker where every track nearly sounds the same? I guess if a producer is going to do a remix, I'd rather have them take the parts and do it in there own style that represents them as an artist, no matter how much it resembles the original. After all, that is what you're paying them for.