Man it is hilarious watching fanboy breakdowns here and at the ign comments sections.
While most of the list is questionable (particularly the placings of PS3, xbox 360, Gamecube, and Wii). The top 5 is rock solid.
It seems most people here think PS2 deserves the top spot for selling a lot. If this was a list of success, Wii would be #1, but it isn't, this is a list of great games combined with industry impact.
Atari created the console games industry, but also destroyed it. Nintendo created the modern day gaming industry and had a load of great games to boot.
PS2? it sold a lot, and a lot, but that's about it. It had a great library of games which is why it's #3, but many would argue the SNES (#4) had a superior line up.
Keep in mind this is just one websites opinion, don't like it? go make your own list. Just because someone else doesn't drool over the same system as you do doesn't mean the list blows, it's their list after all.
