Of those listed I counted 21 which I own. I also have others which were not on that list, but are still great games such as Godfather.
The issue I have with Wii games in general is I don't like motion controls. Games which work with the classic controller I have no problem with. I'm not a graphics freak and I don't mind at all if games aren't in HD, but I absolutely hate the wiimote as a controller. In many cases games are made tougher than they need to be simply because you have to fight with the controls to get them to do what you want them to.
Although many of these games listed are Wii exclusive, some of them are multiplatform, and so if you have a PS360 and a Wii there's not really much reason to get the Wii version. Not only will the graphics be better with the PS360 version, but you will also get to use a traditional controller which actually responds and does what you want it to do without having to fight with it. If something like Goldeneye 007 were Wii exclusive it would be a no-brainer, but since they also brought it to the PS360 why would you want the inferior Wii version? The same goes for the COD series, Rayman Origins, and all the other multiplatform titles on that list. Yes, they are awesome games, and yes they are on the Wii, but the Wii version is always inferior.
There are a lot of these games I don't own yet which are on my wishlist, but I am reluctant to buy them simply because I have a feeling they are going to be remade and enhanced for the Wii U somewhere down the road. HD graphics would be a nice enhancement for a Wii U upgraded version, but what I really hope for is improved controls. So I think it pays to be patient with many of these games, because if we wait long enough we will see them return in a better form.
The Wii games which are most worth buying are the ones which are 1) exclusive to the console, and 2) ones which are fairly niche and unlikely to be re-released in an enhanced form in the future. If a game isn't exclusive to the Wii that means a better version exists now, and unless the game is really niche then it would pay to just wait because there will probably a better way of getting it in the future.
That said, I think something like Cursed Mountain epitomizes the sort of Wii game people should buy. On the one hand its Wii exclusive, so there's currently no other way to get it, and on the other hand it seems to have sold poorly so its doubtful its ever going to be re-released in a better form. Its also cheap and apparently a great game. So in every sense it fits the bill for a must have Wii game. But something like Donkey Kong Country Returns even though its a great game, the controls suck and since its a 1st party game and one which has sold well I would bet money that Nintendo will re-release it in the future, so unless you want to play it right now you might as well just wait.
But yeah, Cursed Mountain and the games of high calibur but poor selling like it are definitely a no-brainer to invest in. We will likely never see them again in any form on any console, so it makes sense to get them now while we can.