As I said before:
I'll disregard the price.
PC: 10/10
It has all and does all. It pretty much rules. Upgradeable, always cutting edge, has more developers working for it than any other console, has all genres you could imagine (and more), backwards compatible, future proof. Has it all. Games don't have to be dumbed down to adjust for lower resolutions and fiddlier controls that consoles have (*cought*RTS*cough*). The only downside is that you need upgrades relatively frequently, and that's the fiddly part. Another downside would be the many thousands of dollars required, but I have disregarded the price so that point is moot
Xbox 360: 7/10.
Huge library of games, with a growth tendency, because the console is popular with developers. Decently powerful hardware. The good thing is that since the hardware is standardized, once you make one game you know how to make dozens more. From the user part, the fact you never have to look for new drivers, new hardware, new software, makes it more practical.
The downside... not many genres, and of those present, many are extremely ill-suited for a gamepad (FPS? Come on.).
PS3: Hmmmm. Hardware: 9/10. Games: 2/10.
The thing is, while the PS3 is a very powerful machine, nobody actually knows how to use it. It's like a huge alien artifact, and it will take years of poking and probing and studying to get to know it, and to learn how to make games that take full advantage of it. Current games are merely scratching the surface of what the PS3 can do, and like all scratches, seeing them makes you cringe. Very few good games (for now), but we can expect more really good ones in the future (when, and indeed if, they manage to start this monolithic behemoth to a run in any direction). Again, expect very few genres, but fortunately, the genres present are the most popular ones, so most people are set. All the console-specific characteristics present in the Xbox360 apply here, only the PS3 should last longer (we'll wait and see if it actually does, though).
Wii: Hmmm again. Hardware: 10/10, games 6/10.
The hardware is more than enough to make great, revolutionary games, but what the developers are doing with it is criminal. It's like a command-line-adventure-game developer seeing a touch screen for the first time, and saying "cool, now you can write commands by hand instead of typing them", and completely and utterly failing to see the possibility of a point & click system. Thinking outside of the box was never been the developers' strong point, to the point where they try desperately to follow the same old ruts even when the box has changed its shape to something completely different. "Pushing the envelope" becomes very wrong when the envelope has turned into an origami frog around you, and you failed to realize it (because you're busy pushing).
That being said, I must add that the Wii a) does have some excellent games, b) isn't aimed at the kind of crowd that would do this kind of comparisons anyway (because they wouldn't consider getting any of the other consoles at all). The problem is the "target audience" isn't the same as "actual owners". The community of actual owners is extremely schizoid, divided into business people/your mother on one side, and gamers on the other; ones being giddy with excitement to see the character on screen respond to random Wiimote waggling, while getting stuck on higher levels, the others expecting new, revolutionary, pinpoint precision controls at lightning speeds, and not getting them, with developers trying to create games for both sides at the same time. Result: not so good. Very much so. The sooner the Wii-oriented gaming industry divides games into casual Popcap-Games-like pointer clickfests on one side, and hardcore games that use every last bit of what the Wiimote can measure/register to create wild new control schemes and provide serious gameplay that the Wii hardware is actually capable of on the other side, the better.
