I have such a weird relationship with 21st CBD. I lost interest in Green Day a little when American Idiot came out, I was really jaded back then and not into the whole rock opera thing (i've come around on it). 21st actually got me back into GD though, there was a lot of stuff on the album I liked, and some stuff I didn't, like Know Your Enemy... I really wish they'd drop that from their set, it's so boring and repetitive. Anyways, now that almost 10 years have passed (holy crap!), I think that it's my least favorite album. I'm not saying it's a bad album, I just feel like they were trying to push themselves too hard to make a sequel to American Idiot. AI seemed naturally epic and fun, but with 21 it almost like seems like they were forcing it a bit.