It's not my favourite album but I don't think it contains mediocre songs: some bad ones (yes) and some great ones (yes), the rest just good (yes)-exactly as any of the albums from the guys, only that each one has his/her preferences, in my case -a strange one- I love Beatles For Sale.
I don't think that the guys would continue with the psicodelia thing more than a few mounths, they were very much than a psychedelic band (remember: always a different work: Lp or film, and don't repeat yourself -if it's posible) and their friends Stones, Dyland,... were going to do the same: go on. Anyway Psicodelia was going to be an old-fashioned style in a very short of time (not more than two years).