Oh me too! It's something I do with all my albums.
My worst concert experience was (and you're going to be surprised at this) was probably The Killers in Munich last year. It came just after the amazing Berlin concert (where I was barrier, met the band, and basically everything went right). I'm sure the band were on top form but a) I hate the Zenith as a venue, b) I got there too late so couldn't join my friends in the pit, c) I spent the first few songs squashed up against the chest of a security guard who was pretending to be a pit barrier as the metal barrier didn't reach across the whole hall, d) When I decided to move further back, it took me a whole song to get through the crowds, e) the crowd were very aggressive and not really there for the music from what I could tell. My friends in the pit almost lost their footing during Spaceman and got thrown about the mosh pit all concert. They were so intent on not getting crushed that they couldn't really enjoy the concert.
From a musical point of view, the worst thing was Jan Delay, a German hip-hop star. I had to endure him at two festivals last year. Terrible. His band and the background singers were good but I just find him so disgusting. He was playing between Bloc Party and Mando Diao at Rock im Park and before Mando Diao and Franz Ferdinand at Energy in the Park in Munich so I was kind of forced to put up with him....
My best concerts were (a selection):
The Killers, Berlin, March 2009 (see above)
The Killers, Hard Rock Calling, June 2009 (an epic run to the barrier across half of Hyde Park and an exhilerating performance, also the first time I'd seen them in London)
The Killers, Cologne, August 2008 (the setting (directly in front of the Cologne cathedral), the weather, the company, first time seeing the Killers since the Sam's Town tour and rediscovering their amazing live show, etc)
Bon Jovi, Munich and Manchester, May and June 2008 (don't laugh, they are amazing live and those two dates had particularly amazing setlists and were great all round experiences)
Bon Jovi, Wembley, June 1995 (my first and only time front row of a Bon Jovi concert, nowadays you have to camp out to get front row...)