[SLTE]

My wife picked MK up when it first came out, and it was absolutely teeming with players. You could find people on at pretty much any time of the day without fail. That remained true for about two months, at which point I started losing interest in it. Not because it wasn't still fun, but I'd just played it way too much. 

I came back briefly for each of the expansions, which, admittedly, featured some fun new tracks and characters - Link's track is one of my favourites - but the initial fervour didn't last nearly as long, and the multiplayer seemed to die off more quickly than when the game first came out. Maybe I'm just playing at the wrong times of the day?

[First2Play]

I need to get on this game. I didn't even know they were up to number 8 lol. I was hooked on the original Mario Kart for months when it came out.

[rainhero]

I am, and I totally love Mario Kart. One of my favorite games to multi-play. I have never played any games using the online capabilities though, we usually just stick to multi-playing with each other in my house.