I have it too. I'll post my code when I get a chance.
I've not been having a blast, but it's pretty good. The wheel is fun for a little while, and then I have to switch over to the Gamecube controller because I get frustrated at the lack of accuracy I feel from the wheel.
There are also lots of little changes they've made to the gameplay mechanics that I really dislike, and change the whole way I play. One example: you know how after you hit an item box, the items start spinning for a while in your H.U.D. like a slot machine, and then finally stops on the item you get? Well, in Double Dash (and I believe Mario Kart 64), you could press the "use item" button, and it would stop that spinning almost immediately. I did this after every single item and it got me a huge leg up on the other racers. It also meant that when the boxes weren't in a straight line across the track, there was potential to get two items at once.
In the new version, the "use item" button merely slows down the item selection process, and without it the wait is interminable. It's next to impossible to pull off that two-item trick I mentioned.
The other HUGE gripe I have is the button layout for the Gamecube controller. I want to meet the person in charge of it and beat them over the head with my Wavebird. First of all, why they had to change the layout from the perfectly functional layout of the previous game is beyond me. What's my problem with it? Well, everyone who's played Double Dash, imagine this: move the "use item" button from the X or Y button, and put it on the L shoulder button. First of all, that's a terrible position, but the major problem is that it takes A LOT of travel to press that button. For a game that is all about split-second decision making, that's a bad design.
I wouldn't have this complaint at all if they had just done something so simple as to give the players the option to change the button mapping. But that leads me to another complaint. I urge everyone to pick up a copy of Brawl and simply go through the options sections. I think that game has more content than any I've seen. Then comes Mario Kart, from the same first party publisher (I'm sure it's different teams, though), and what do they give us? Almost zero options at all.
I think my problem is that the game feels incomplete and very plain. It's like they didn't put much effort into it. The way I see it, they made a ton of changes to the gameplay that I think are negative, and the only thing I like more about the new game is the inclusion of classic tracks.
Sorry, I didn't mean to derail this thread with what sounds like a negative review, but I had to vent. I'm still going to play the game, but probably just with my friends. I wanted to unlock everything in the game, but they've upped the difficulty of doing that so much I just don't feel like doing it.
I think Wii owners should all pick it up because it's Mario Kart. I don't think, however, that it's a game that's worth buying the system for, which is what I did. I just did it a year and a half ago.
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Matt