That seems rather silly. Adventure fans are some of the most respectable gamers around (that's probably genreist, but it's still probably true). Meanwhile, shooter, RPG, strategy, etc gamers of all kinds get to mod their games up the yin yang, and as un-respectable as some of them are, they didn't do anything to "sully" those brands. In fact, those games became more popular. I admit the mod scene for shooters and other games is different from adventures, but still. The ability to play around is attractive.
Anyway, it doesn't matter now.