I may have played a few shitty games in my life that I certainly regret playing or remember, but I wouldn't say I'd want to forget them. If I forgot these games exist than I may run the risk of buying it again or buying a game similar to it. Better that I learn from mymistakes and become a better person for it than to be naive and believe everything I get is gold. Also, part of the reason that the best games truly are good is because they stack up WAY better than the bad ones (if all we had were good games, can we really define it as "good" and not just "games"?)