Just played Mario Kart Wii for the first time ever and I gotta say it's a ton of fun although far inferior to MK8DX. But still more fun to me than any of the handheld Mario Karts, mostly because of the motion controlls and always pressing down the accelerate button doesn't give me a cramp in the thumb.
I don't like that every character has their own karts and bikes whereas in MK8 you can choose any kart, bike and even quads no matter which character you choose.
I also like it more with two items than one and MK8's item selection is better. That block you can stumble over for example isn't much different from banana peels.
Mario Kart Wii controlls very smoothly and the tracks offer a lot of shortcuts, which is fun. I like it, my second favorite Mario Kart.
Now I just need to play MK64 and Double Dash. MK64 I will eventually play on NSO and I'll wait until DD is also on NSO, since I'm not willing to pay 70€ for a used copy in good condition.
My ranking of Mario Kart games:
1. Mario Kart 8 Deluxe
2. Mario Kart Wii
3. Mario Kart 7
4. Mario Kart DS
5. Mario Kart: Super Circuit
6. Super Mario Kart
The only one that I don't like is Super Mario Kart, because I just didn't have any fun playing it. It controlls awefully.
Super Circuit is far superior.
The best soundtrack is in MK8 ans DS.