Well, the thing is... some old games are only playable if you already have played them "back then", others are "just ugly", no matter the story and how awesome they are and were. For example, I think could replay Giana Sisters anytime, but I doubt I could do that when I had the memories I do have.
Personally, I start Commander Keen 4 or 5 every now and then, and Monkey Island is just a feast to me.
Same goes for Indy 4.
