Almost every album is different - for his early period almost every critic admires We're Only In It For The Money, and for his mid-to-late period the same seems to go for Overnite Sensation and Sheik Yerbouti.
You are out of your mind. "Unfocused" is the absolute LAST word I'd use to describe Zappa. Have you ever attempted to play some of his numbers on any instrument?
Zappa used to get the very best musicians, write out the sets they would play in concert, then 10 minutes before they went on stage, he’d go out and rearrange their music so that each one started on a different song! He thought that was hilarious. Didn’t do drugs. Weird beyond belief, though.
I would say his taste was questionable considerably more than sometimes. Which is, of course, absolutely irrelevant to his artistic standing. He was a social commentator along the lines of film maker John Waters, who sometimes has us looking at ourselves in a very uncomfortable fashion.
You look at his work, see that it different from record to record, and call it unfocused. OK. I look at the same body of work and say, wow, one man could do all that? To that level of expertise? Truly remarkable from where I sit.
He is under-rated as a guitar player, and way under-rated as composer. Lyrically, the juvenile locker room stuff leaves me a bit cold (as it does with John Waters), but it doesn’t prevent me from recognizing his serious talents. But, of course, all of that (like your comments) is purely subjective, personal opinion, without a single shred of objectivity.