Well, for one thing, the results come in this special table format, where, if the path names are long, you can't resize the column. So, you're stuck trying to find the folder a certain file is in by hovering long enough over it and try to memorize the location.
Not so much for searching, but the fact that Windows 7 decides for me how to display folders with media in it, is super-annoying. I deal a lot with waveforms at work, and I care 10 times more about the size and the creation date of the file than I care about the supposed artist or the album name (neither of which even exists).
In XP you could force that shit to "details" view, and there was no automatic displaying from there on.
rumborak