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.
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?