Aerosmith. Loved their first few albums. Since then....meh.
Aerosmith seems ripe for wax-waning. Mentally I divide the music "Before Run-DMC" and "After." Not that the style and sound radically changed from 70s period to mid-80s onward, it's more like the group vanished, then suddenly came back alive and got more huge (and hence, maybe more likely for oversaturation).
I never developed a love/hate for Aerosmith because I wasn't highly familiar with the early period prior to the 80s surge, beyond about a half-dozen songs.