If I recall, the argument against Weezer's "Blue Album" was that it had no lasting impact. Two points: (1) it was emo before there was emo (2) they made it cool to be nerds/geeks well before the geek-cool wave of the late 90's/early 00's.
Knowing that we're looking for debut albums that sold millions, altered (at least somewhat) the direction of popular music, and was critically well-received, I offer one more suggestion...
<img src="http://ec1.images-amazon.com/images/I/31HT8GP93DL._SS500_.jpg" alt=" - " />