I'm not going to mention them by name again, but everyone who's read my high-octane rants against a certain bassless male/female duo knows whose appeal I find the most mystifying of all. Whereas, like Zerkalo said, the likes of Colfdplay/Keane/Stereophonics aren't even interesting enough to hate.
I'll second the Jam and the Clash as well - but what's a Cnut?