Oasis, Blur, Pulp, The Bouncing Souls, Mad Caddies, Guttermouth, Less Than Jake, Pitchshifter, Ocean Colour Scene, Rage Against The Machine, System of A Down, Bentley Rhythm Ace, The Prodigy, Vanilla Pod and a host of others.
I'm not embarrassed about my musical past at all and I don't even think all of these bands are bad by any means, but I now feel like I wasted time and money on them which would have been more productively spent elsewhere had someone only pointed me in the right direction earlier.