I'm with you. There no reason not to have it really.
My snobby old school gaming side looks at achievements and thinks "meh, it's just a cheap and lazy means by developers to make you feel accomplished when playing their games," but there's no harm in satisfaction I guess, even if it's cheap. I really do think achievements/trophies provide incentive for a lot of people to keep playing.
I really think if the Wii had a more fleshed out online system, complete with an achievement/gamercard type system that could be shown off to others online, I have a feeling there would have been a lot less of this "my Wii has been gathering dust for months!" talk from these hardcore gamers. I thnk some people just need that little bit of extra satisfaction from playing games these days as games seem to be getting easier and shorter, to make way for more polygons and cutscenes. Not my prefered situation of the state of gaming, but it is what it is..
Also, people in this day and age of the internet, cell phones, facebook, blogs, etc, people like to feel connected, and share information about what games they are playing, what they've done in the game, and like to see what others are playing. When I play Wii, even though it has a lot of fun games, it feels somewhat isolated, with the exception of a few games like Mario Kart Wii. I think this is an overlooked reason to why some of these core gamers myseriously "get bored" with the Wii and it "gathers dust," despite the fact that it has dozens of great games.
Kinda went off on a tangent there, but the point being, I think Nintendo will be doing the Wii U a favor at least a little bit by having it more online focused, and that includes things like better online chat, achievements, gamercards, etc. It couldn't hurt anyway.
