I'm with the notion that Oblivion changed Lore, not ruined it...albeit, in a negative fashion.
Everyone needs to come to terms with the fact that Oblivion is a game, and marketed as such...
On statement 1: Morrowind changed Lore, not ruined it by
taking what was there and fleshing it out. Vvardenfell is ashes before the game, but when it came out it's mostly ashes with a few fertile areas along the coasts. Oblivion took what was there, ignored it completely and inserted Gondor. That's changing lore and ruining it.
2: Morrowind and daggerfall were games and marketed as such, how come they're "Great" games and Oblivion is a 'Play through it once and leave it because it was just OK" game? DF and MW were socially relevant and deep, and were marketed as games, Oblivion was fantasy cliches with no relevance or philosophy and was marketed as a agame. You see where I'm going with this?