I rate it like I do all of STP's music, depends on the day/month. I can think of periods of time in my life where every album has been my favourite. When I joined BE Shangri was my fav, so that is what appears next to my name, but really all of it is just fantastic.
No.4 to me represents the struggle between the harder sound they established earlier in their career and the heavily artistic sounds that came from shangri.