I love Green Days older stuff, but the newer albums have been aimed much more at the mass market, and not as fun
I saw them live at Leeds festival a couple of years ago, and it was awesome! The only complaint I would have is that the crowd acted like complete dicks. I had to bail out of the moshpit cause people were going down and not being helped back up. I ended up watching them from a hill with a pint of beer
H.