I like some of the old Weezer, but I don't like Green Day much. I don't know if I'd compare them to Weezer. They do have a Green Day kinda sound, though. Just more rockabilly. I think it's the accent.
Some how I like them more than Green Day. They are pretty cool in short order, with a style that is similar, but not the same, to other bands. What I'm trying to say is they remain unique. I have to admit, I don't think they are fun to listen to over and over and over again.
pretty much just the style is similar to those two bands, power chord rock