I'm going to go out on a limb here and say they're all pretty much overrated these days. I collect & play a lot of games, but it's really gotten out of hand, just look on youtube or other large public forums and you'll see so many people that are just too emotionally invested in these to the point of taking it personally if you don't like a certain game or system. Just google "video game death threats", jeez, lets keep things in perspective here!
That's not a symptom of game collectors so much as it is a symptom of internet regulars. Go to any forum, video games or not, and you'll get the same kind of passion and hate. Comic books and metal forum that I frequent are certainly that way with some users.
Star Wars fans are like that too. I'm in a lot of predominantly positive groups too, like this one. Collectors are more likely to fall into other vices.
BTW Game Boy Color is my real pick for overrated consoles, besides the improved screen and palette options/backward compatibility for your old games, it felt like more of a color upgrade than a new system. Compared to the jump to GBA that is. The library is a minefield of crap, but of course there are plenty of good ones to find due to sheer volume. To be fair, a lot of the licensed games weren't meant for my generation, and must admit I sort of got into Matchbox Caterpillar Construction Zone