you get what you pay for, comes to mind, but I suppose that's a given because it's applies to all things in life.
To me the wii has the least value, it simply doesn't have the games I like, so all those big selling games on wii are all well and good, but if they have no appeal to me then their is no such value, and many people are like me, after all this is all subjective and even with a definition of value, each person has their own mental definition of what for them is value.
So right now, people wanting Modern warfare 2....well they'll get it on either the PS3/360 or PC, same goes for bioshock 2 and many other games not available on wii, so while the wii has a few singular titles which sell way more than it's competition, they don't have that broad range of high selling games that the PS3 and 360 have, I mean just buy looking at forum chatter of games people want and are coming this year, a majority of those are not on the wii, and to people like my self, if the games your interested in are not going to the wii then it subtracts value from it, more so if said person doesn't like the Nintendo games.
So apart from gaming the wii has little left to entice me with, and entice me it did not, with lack of proper online and games that support it, well it actually repeals me since I like online gaming, now one could say "you get what you pay for", this doesn't hold true because like Nintendo, Sony's online is free but far superior, with the 360 being top dog, but that service you pay for.
Now since the Wii has no proper media functionality, for me at least, the Wii has nothing I want, and yes I do love the media functionality my PS3 has, why? simply because some times I don't feel like playing games but prefer to watch a blu-ray or DVD or what ever I have on my portable hard drive, so to me at least the PS3 is great value since I use most if not all it's features, I know some will point out that I could just use a dvd player or a blu-ray player but the point is that with the PS3 I don't have to, so at least I save money on actually buying a blu-ray player which I don't currently have, and I'm sure there are many people in my exact position either with PS3 or 360.
I know allot of people will probably cite the Nintendo games as being worth it, but I'm not a Nintendo man so there games have no appeal to me, grew up a sega man and then migrated to sony consoles, and it's the Sony franchise's the appeal to me the most, the 360 also have some great franchises and at the end of the day you buy a console to play the games you like...having said that though, Nintendo, are simply pushing me away, I suppose though that at the end of the day I'm not their core market.
In the end, saying "Wii is the console with the most value" is wrong, as value is a subjective matter and highly dependant on peoples taste in games and the availability of said games on each console as well as each person desire in other features apart from gaming which may or may not be present in each console machine.