If you think Screaming Bloody Murder was a "misstep," I'm curious which of their albums you consider to be good. Screaming Bloody Murder was a bit lacking in the pop/punk side but had elements from every other album of theirs on it.
It was an album that had the sound I was hoping Sum 41 would go for, but it just lacked anything memorable to me. There were a few decent songs, but it just seemed to be missing some hooks that I enjoy most with Sum 41. I'm okay with "lacking in the pop/punk side," - that's not the issue. I just felt that if you asked me to recall anything off of that album other than the title track and maybe Blood In My Eyes, I'd be stumped - and I've listened to that album at least five times.