Historically Nintendo has always been head and shoulders above Sony and Microsoft when it comes to reliable platforms. I don't think I've ever heard of issues with a Wii, Gamecube, whatever. I've owned all 3 at one point or another and I have to say my PS2 lasted forever but still had occasional disk reading issues, as does my 360.
I got my 360 for free, and I like it but if I had to go out and buy something right now it would be a Wii. If they included Blu-Ray somehow they would be killing Sony.