I think if you go into listening with little expectation then it's really easy to get into this album. I went in with a lot of expectation, and still ended up loving it. The first listen was a little iffy for me. After hearing AB/AP (the song) and The Kids Aren't Alright I got into my head that this would be Fall Out Boy's version of Danger Days by MCR. Fun and unapologetic about it. The standouts to me are Uma Thurman, Jet Pack Blues, and Fourth of July.
I agree with the comments above though. If you liked Save Rock & Roll, you'll like this album. I think a lot of people just haven't given them a chance because they are different than FOB used to be. And for some reason when songs start getting radio play, some folks immediately file them in the garbage category. I also remember people hating Folie and then over the years changing their minds. So maybe that will happen with this one for some of you. But I mean, if you don't like it you don't like it. There are plenty other bands to enjoy. FOB for me is one of the few bands that I liked in jr high/high school that I still love today.