The 95% games of the games were not advanced graphics-wise, compared to the technology it was running on and the best looking games. They weren't bad looking because the developers were going for a "hey lets have awful graphics in here, gamers will luw it", they went that route because of budgets etc. With better hardware, developers can reach a higher graphical fidelity with less work. Works out great for everyone.
And to turn around this broken logic of you, let me ask you: weren't 95% (if not more) of the games sold last gen absolutely not worth buying? IMO, for me last generation, only the 90% (not all of them) rated games were worth buying and keeping, most of the 80-89% games were "remakes" of some other game.