Personally all of them are horrifically weak for being the seventh generation of consoles. Good ps3s are much more pricey with no real benefits over Xbox 360. However, Xbox 360s are as fragile as an 80 year old woman with a lifespan to boot. Just like people that smoke, 1 in 3 go defective. As for the wii, the wii is just fucking terrible. I can't believe anyone would like that horrid dogpile. Apparently no one seems to care wii is like the landfill of rotten games. But back to the subject, if I was held at gunpoint and ordered to select what system I would prefer rather than having 3 pieces of lead in my forehead, I'd go with Xbox360. Its fun but useless gamerscore is a nice edition no matter how important or worthless you find it. And most games have a rich, reliable online play that doesn't leave you seeking for 3 minutes in a blank lobby only to be disconnected or lagged out after finding players like other white consoles with shitty remotes and shitty games. Ps3 has its good points, but when you see it you're reaction is pretty much "oh, that console. well thats nice".
But really, buy an xbox 360. They don't really go defective. Or scratch your discs. or produce discoloration/video failure. Or reject your 3 year warranty under certain circumstances. Or disconnect you due to charging your old credit card after you changed it to a new one even though you updated the new one under your account days ago. Or make loud humming noises. Or supply you with merchandise meant to prevent damaging that actually causes more damage than it helps. But with that set aside, we all know microsoft had to cut some corners on production. If anyone needs to save millions in production costs its the microsoft corporation.
However, its still safe to say that xbox360's minor failures are simply shadowed by the tremendous failure of nintendo.