I don't deny that Oasis became a parody of themselves. At work, our Cheif Exec produced a new strategic plan called the "Masterplan", and passed it around middle management for comment. My response was that The Masterplan was a mediocre album by a second rate Beatles tribute act. Nonetheles, Definately Maybe and Morning Glory are far better, IMO, then anything I have heard from Blur.
Like I said, may be northern bias; we have family links to Manchester, our kids were just at the right age at the time to think Oasis were wonderful, and at the time the local media were all over them.