High end graphics = more heat = more warping of innards. (What Xbox 360 and PS3 are prone to). I would also like to note that both have hard drives, which could possibly result in more problems.
Nintendo in my opinion also has been the most reliable. I never fear a launch Nintendo product. For example, my N64 launch STILL works, and I continue to play it to this day.
I was plagued with a faulty PS2 last generation with the disc read error problems X_X Something I can never forget, nor forgive. I did not have a problem with Xbox or Gamecube.
That's why I chose an Xbox 360 this generation, though I did wait till the falcon motherboard and 175w power brick. No problems so far *crosses fingers*. No problems with my Wii :)
Everyone needs to play Lost Odyssey! Any opposition to this and I will have to just say, "If it's a fight you want, you got it!"