I like this! Best for me would probably be The The at Ally Pally and also Weezer supporting Guns and Roses back in 2002. Worst, can't remember the date but one of the times I saw Ministry they were *really* bad and we left early. Also Foo Fighters, they were just really dull.
Best bands I've seen live? Radiohead or Enter Shikari. Worse? Red Hot Chilli Peppers or Babyshambles