Everybody's entitled to their opinion but by heck, these two reviews are harsh.
I agree that there isn't a cohesive theme to this album, and for that reason, it could never qualify as great, but what they have done across multiple genres is pretty catchy. I like more thoughtful, deeper stuff, but pulling off a memorable 3-minute pop song is no mean feat, and they've done that several times here. Cohesive it isn't, but it's certainly doesn't lack variety and only the attempt at country doesn't work for me.
Anyway, each to their own.