Now wait a minute, "Gimme More" is infamous for her doing a terrible live version of it, but that doesn't affect the song itself, which is not noticeably of a lesser quality than her previous work (granted, it's no "Toxic", but it's second tier as far as her singles go). It's not like she wrote it herself, there's no reason for it to suffer any dip in quality, and it doesn't. If you don't like that song, you probably weren't much of a fan to begin with, in which case you weren't expected to like it.