Worst was probably Stone Roses at Spike island, I wasn't that far back and central and could barely hear a thing.
The PA system they had just wasn't up to it. Bit of a shit day all round as well. good fireworks at the end though.

The most surreal was Primal Scream at the Uni great hall, just before Loaded came out, they came on stage to be greeted by a sum total of 13 people in the crowd, fair play to them they did a full set but I've never been able to count an audience before..