Okay, so the "Old School Renaissance" (or Revival) is on a roll right now. Serious efforts are being made to bring back the days of D&D gaming from the original D&D up through AD&D. There are quite a few products out and more on the way. In addition, Wizards of the Coast is pouring gasoline on that fire by reissuing earlier D&D products as pdfs.
But I still don't understand the appeal of the early editions of D&D, particularly the pre-AD&D ones. When I played D&D for the first time (back around 1978) my friends and I thought it really sucked. My take away was that it was basically an exercise in sado-masochism. Sadism is inflicting distress on other living creatures for enjoyment; masochism is the desire to receive said distress. So what does that have to do with early D&D? Allow me get all controversial here and provide a couple examples:
Straight-up 3d6 rolls for attributes. This frequently has two negative results: getting stuck with one or more very low attributes and/or not being able to play a particular class because of those low attributes. The sadism part is deliberately setting people up to have crap dished out to them by the dice and constantly play a class they don't want to play; the masochism part is coming back for more of this abuse over and over
Class level caps. This creates a "glass ceiling" for certain classes, typically the demi-human elves and dwarves. The sadism part is the arbitrary imposition of a level cap, apparently along racist lines; the masochism part is playing a class which is ultimately doomed to 2nd-class citizen status.
BTW, I recently bought Adventurer, Conquerer, King System (ACKS) which commits these and other sins. However, I bought it for the interesting economic and political rules and will be doing a full review in a bit.