Perhaps people dislike Dos because Lady Cobra raps on it and not Billie Joe. It's the first they have had a real guest on anything. If it was BJA rapping would you hate it?
Well yes, seeing as the lyrical content would make it even more ridiculously awful.
Besides that song though, I think Dos is pretty good. A lot of good tunes, I especially like Amy, Billie Joe really knows how to handle those ballads and his voice sounds great. If only they could have taken the best songs from each and done one album, it would have blown people away. I havent gotten to fully digest Dos yet, but I'd take Nuclear Family, Stay the Night, Let Yourself Go, Sweet 16, Rusty James, and Oh Love from Uno for sure.