i'll suggest that the record sounds like there may have been some time spent away from jamming, in the sense that it's a bit more ordered. reviewers that have never written a song before generally tend to get this backwards by applying some kind of intelligent design theory to the ordering of sound. when it comes to this kind of rock music, "sloppy and messy" indicates that a lot of time was spent on it and "snappy and catchy" indicates that you're getting something a bit more raw. the reason is that the songs come out of the basic architecture of chords and riffs and grow and morph into big, sloppy messes. it essentially never works the other way around. this is really true of all music, but rock as an artform is especially inherently deconstructive, chaotic, unraveling...
it's normal for a band to release a disc or two like this over the course of their career. they work themselves into the discography and make a place for themselves. sometimes, they indicate a band is falling apart, but it's usually out of practical realities, and i don't get that impression, here.
the key thing about this band has always been that guitar tone, and there's really been no loss in it's crunch.