I've only seen Metallica once and that was in 2009 but I had a great time at the show. I thought not knowing what they were gonna play was exciting and I thought the guys put a lot into their performance and interacted with the fans a lot and seemed to be having a really good time. I know that maybe James vocals and Lars drumming is not the best but I didn't find their musicianship to be so lacking that it detracted from the show. I would definitely like to see them again.
I could see how older fans may feel differently though.
5/4 - Rob Zombie
5/11 - Ghost
5/13 - Mastodon / Gojira
5/21 - Primus
6/28 - Iron Maiden - Bergen, Norway
7/1 - Iron Maiden - Luxembourg