As a average consumer maybe it's overrated. But the games are selling for a high price for a reason. And most playstation games are also selling so cheap for a reason. No one wants them because 3D was trash in that generation for the most part. Saturn did 2D to rule them all, and that's why people will pay top dollar for that reason. In fact the only playstation games in demand are mostly RPGS, and 2D games. I don't think it's fair to say its overrated because the RPGS are out of some peoples price range. If say that person came rich and could afford those RPGS would it suddenly become not overrated?
I don't think it's that simple though. Games are expensive only because supply does not meet demand. This can be because the game is rare, it's actually a good game, or both. So, an expensive game doesn't have anything to say if it's actually good. And because a game is cheap doesn't mean it's bad.
But I think it's very important to remember that whether a game is good or bad is based on opinion alone. Certainly a person is allowed to think that a certain expensive game on the Saturn is not that good. Thus they may not think the price is not worth it, (thus overrated), while you may think otherwise.
That's ok! I don't really see a problem with people not liking a console if they don't think the price (or the hype) is justified for the games. I respect that opinion wholeheartedly, (I'm sure you do too!)
Concerning the PlayStation, Tron Bonne and MML2 are two games that I can think of that are expensive but aren't 2D or RPGS. Or Intelligent Qube. Or Tomba! Be careful with absolutes like "only"
I think most PS games are cheap because more people had a PlayStation, more people bought these great games because of the larger install base, and so these games got more printings and releases. That made it easier for everyone to have a copy, and so supply/demand is better, and prices are lower. Doesn't have anything to do with the game's quality per se. (Again, not always the case, see Suikoden II)