@makingmusic - I dont meant to cherrypick your post, Im in a rush =)
Assasin's Creed really is not much more than Thief redone and made more violent, so the concept for AC is over 10-15 years old. LBP didn't really bring anything to the table other than a level editor, which is no new concept in gaming, in fact there's an internal argument that LBP stole physics ideas from World of Goo, its hard to say who was there first.
It just seems that your laundry list you posted is somehow unique gaming where you then ask what makes the Wii games unique. Your list of games have already been proven and done before in the PC gaming world, you just might not have gotten the chance to play those games. Just because a game is popular does not make it innovative or original. As for the Wii games you ask about, the motion control systems make the experience unique. Sure, mouse games are nothing new, but you cant swing your mouse across the room to get it to perform actions on screen.
The only thing that really shocks me is this line: "Sports games and racers are really the only genres I've seen that have truly benefited from the Wii Remote thus far "
...that's really closeminded for a person that Im sure is in fact NOT closeminded. You really need to get out there and play more Wii games. Start with RE:4 on the Wii, the controls enhance this game in ways that have impressed developers worldwide.
Of all the Wii games I've played, only titles like Mario Kart and Wii Sports did I feel were a geniune improvement over their predecessors. RE4 was an improvement over dual analog controls, yeah, but the IR sensor isn't as accurate as a KB/M. Is it a nice alternative? To be sure. Is it a revolution? Not really. Metroid Prime 3 would've been a much better example to use here, given the grappling beam and other devices. And I'll admit, this game completely slipped my mind until just now.
Actually using a wheel to drive without having to buy some $150 steering wheel that only works with a handful of games, now that's a pretty significant thing. Plus you can do all types of extra cool things while steering with the Wiimote, like popping a wheelie in Mario Kart.
As for LittleBigPlanet, the majority of its gameplay concepts are indeed wholly unoriginal. What's unique about the title is the way everything is packaged together. It's essentially the YouTube of gaming, but with a built in level editor and the simplest drop-in/drop-out multiplayer (online or off, the mix of players doesn't matter) I've experienced. Media Molecule have made it incredibly easy to access a plethora of usermade levels, all streamed much like YouTube, and have made it rather easy for the more creative individuals out there to keep us supplied with an neverending stream of these levels. The content is literaly endless, and the multiplayer is so fun I haven't put the game down for more than week at a time since it came out.
Also, making a feature popular is almost as important as creating the feature in the first place. Gears of War's cover system wasn't exactly new, but it was the game that made people realize just how good a cover system can be, and it is primarily responsible for games like Rainbow Six: Vegas 2, Medal of Honor: Airborn, and Killzone 2 incorporating cover systems down the line. The game had a substantial impact on the way modern shooters are made.
Another example would be Guitar Hero. Was it an original title? Hardly. They've had Guitar Freaks in Japan for years, and other music games like SingStar and Beatmania that have popped up from time to time, yet it was Guitar Hero that started the music game craze. It took unoriginal ideas and made them into something more, and the gaming landscape was changed as a result.
About the World of Goo comment, I highly doubt a game that was first unveiled in March of 2007 with a full gameplay demonstration stole too many concepts from a WiiWare/PC game released in late 2008. World of Goo wasn't even announced until April 2008, when LittleBigPlanet was well into its closed beta, and the game likely had a far shorter production cycle than LittleBigPlanet. The implication that one ripped off the other is rather bold, and pretty unfounded.