Good fun in single player, great fun in multiplayer.
From the fairly large selection of vehicles, characters and tracks (straight off the bat and more to unlock) to the sheer fun factor of hitting DK on the back of the head with a turtle shell this game has a charm which i find hard to get past.
The game is great in single player, allowing you to challenge your own best times in time trial mode and try for the elusive three star rank in the 8 available cups and 3 modes of difficulty. The Wiiwheel control option is also an innovative delight - although it isnt for everyone - and personally feel that it adds a whole new dimension to the game.
But the heart of this game comes from racing against up to 11 other players online, you can find yourself loosing hours at a time, forever telling yourself "just one more race" and getting a just a little bit competitive.
Unfortunately, though the game is replay-able to an extent, it tends to get a little repetitive after a while and other games will soon take your focus. Some of the items are very unbalanced, and potentially race turning items turn up far too often which can lead to frustration at times. There is not much worse than being hit with the fabled blue-spikey shell just inches from the finish line and ending up jumping from 1st to 5th in the blink of an eye.
Other those very small complaints I would highly recommend this game to anyone who owns a Wii, it makes for a thoroughly entertaining game with just a few flaws.