The Wii may be 4x more reliable than the PS3 and 9x more reliable than an Xbox, but who needs reliability when its sitting in the entertainment center collecting dust. It's the least exciting console of all of them, once getting past the wow factor of it being the first console to use motion controls, its extremely lackluster. The games and the hardware both suck. I suppose we could debate how the games is an opinion thing, but the hardware shouldn't be debatable really. Both of the other consoles provide much more than just playing games, and the Wii really doesn't deliver anywhere else. You can't use it to play DVD's (or blu rays if compared to ps3), and streaming video through a program like orb is terrible, which orb supports ps3 and 360, and I've played media on my 360 through network and usb and it's atleast enjoyable, the wii cannot handle it.
All the extra items to buy are expensive. It might just be me, and someone might term this as lazy, but not all the time do I want to flail my arm around for some entertainment, sure maybe sometimes its fun, but that gets rather old. And I don't know if some games are made to support the motion controller and the classic controller, but even if they were, that adds to the extra items of stuff that you have to buy. I don't have enough fingers to count how many people I know who have a wii and don't even use it, or had a wii and sold it because they didnt use it/didnt like it. I also don't have enough fingers to count how many people I know who have a 360 and have to keep sending it in because of RRoD's, but I wasn't really debating that the 360 was reliable.
And lastly, the price, at $200, makes it more costly than its worth. When it first debuted at $250 it was a good value over the other consoles and the motion controls was something some people have never experienced before. Now, its ideas are old, the wow factor is gone, its value lowered, and all thats left is a white box that can't be expanded upon through software because the hardware is still bad. Thats why the 360 and the ps3 can come out with motion controllers, project natal, w/e else they come up with and just add it to their console, because they actually put good enough hardware in to handle it. While it may not be reliable hardware, I think I'd rather spend $200 or $300 for either type of 360 or ps3 and take my 75% chance or greater of it lasting and actually get some lasting fun out of it, vs 100% chance of not having any fun and wasting $200 on a wii that wont ever be taking its gameplay to a higher level.