I one a PS2. It is my only "next generation" console. I am wuite happy with it. I mean, I get all of my third party love with the system. Grand Theft Auto, Devil May Cry, Metal Gear, TimeSplitters, Red Faction, all EA games, all Sega Sports games, the list goes on. I also get some great 1st and 2nd party games such as Mark of Kri, Ratchet and Clank, Gran Tourismo, and SOCOM. I am quite happy with my PS2.
With that said, I would be a hell of a lot happier if I owned all three systems. Since I only own one system, I miss out on the first party games from MS and Nintendo. I would really love to play Super Mario Sunshine, Metroid Prime, Star Fox Adventures, Zelda, Wario World. Then there is Halo, Project Gotham Racing, and Crazy Taxi 3. I would love to have all of these games, but guess what, I am not made out of money.
I like the position that I am in right now (sitting on a chair). I am quite comfortable, and my bum is in a nice groove. Oh wait, how do I like my console's position? Oh... My mistake.
I think that the PS2 is in a great position. It has tons of third party support, and Sony is publishing some great games. I would much rather have all three systems, but I am very happy with what I have. And I do not really mind if the Xbox or GCN somehow sell more hardware units. I mean, all it means is that the "PS3" would have to prove its worth in the next generation.