30 years old, (good as) married, and having a blast with my wii... in small doses
I'm afraid you'll need to play a waiting game. I'll admit that Nintendo's current line up is all about attracting the casual gamer, and maybe even more so about getting to grips with the console, but from what I've seen of the next year's releases, there'll be plenty to please Nintendo's traditional core.
Project HAMMER looks awesome - just a great old-school style scrolling beat 'em up, with the exception that just about everything can be destroyed. On top of this, you've got the new Mario Title, another SSB title (if that floats your boat), F-Zero, Mario Kart, the Nights remake, Big Brain Academy and most encouragingly, 3rd party developers are investing in the Wii in a BIG way - Manhunt 2 was due to be released before the BBFC and MPAA got involved, but there's still efforts to get a release for it soon.
I think the 3rd party ports are going to be crucial to my long term enjoyment of the Wii - especially if Nintendo continue to focus fairly heavily on the party / mini / casual / open ended style games they seem to be doing so well.
In the meantime, if you've not yet tried it, I'd suggest Excite Truck - easily the most underrated Wii title to date, and a huge favourite in my house - for the first time in a while, I've been replaying it over and over again to try to get platinum awards to unlock new tracks... it's fast, just hard enough, and has a lot of replayability value.
As far as I'm concerned, the buzz has worn off for me a little too, but I love the fact that my gf finds the Wii very accessible, and therefore actually WANTS to play a console for a change, as this makes it easier to validate my gaming purchases I'd suggest doing what I'm doing, and sitting it out for the next 6 - 12 months and then re-evaluating the situation. I for one, have a feeling that Nintendo aren't going to let me down...