in so far as every single song on the album could have been released as a single and every one would have been a top ten hit (when it still meant something mark you), then yes. Other albums are equally great or more so depending on taste and opinion but if you got a panel of 10 people from a mixed background with taste in music I think they would agree that it is going to be in the top 3 no matter what other albums are available to choose from.
Yes, because it lets me wonder how much better the Beatles would have been without their 'drugs phase '.
Don't you mean how much worse?
No. Boston's More than a Feeling or ELO's Out of the Blue or Alan Parsons Project Turn of a Friendly Card.
Loads of other great ones in that era, of several styles. How about Simon & Garfunkel 'Bridge over troubled water' or etheral styling from The Moody Blues 'To our childrens childrens children?, Even Led Zeppelin the album?