Mario Kart Wii a great game nintendo did well.
now there is the 150cc mode. i have one word to describe that mode- CHAOS. the AI is much more agressive than they have been in the past. you are constanly getting bumped around and getting shoved up the road. you might even come across times when you get hit with three turtle shells at one time . its crazy on 150cc but it is still beatable. in this game you have the option of a kart or a bike which is one reason this game seperates its self from the other Mario Kart games. there are a few new weapons such as a giant mushroom that makes your character really big for a short amount of time and you can run over everything. there is also the bullet bill that turns you into a giant bullet bill and it speeds you up knocking out everything in its path. but you still have all of your classic weapons such as mushrooms and turtle shells.
the online mode is great and far more superior to SSBB. it is practicly flawless and you experiance virtually no lag unlike in Brawl. you can race people from all over the world or you can select to only race people in your region.
this game can get very frusterating at some points such as when you are on your last lap and a foot away from the finish like and you get hit with a blue shell and then two more red shells and you end up in 7th and not 1st. but overall this is a great game and i recomend it to hardcore and casual gamers alike.