Though the difficulty is annoyingly hard, the game is especially fun on Wi-Fi.
The controls are fairly simple:
A- pass the ball
B-shoot the ball(holding B will allow you to charge and make a Megastrike)
C-use an item
Holding Z while pressing A- allows you to lob a pass to another teammate
Holding Z while pressing B- allows you to shoot just when the ball's headed for you
D-Pad without a ball- tackle an opponent
D-Pad with ball- depending on which character you have, they will do a move to either avoid another player or defend offensively.
Shaking the Nunchuck- shakes the Megastrike charge meter to distract your opponent
One improvement in this game is the graphics. They make Mario and everyone else look better on the Wii and some effects look more real like ground smashs. Another thing added to this game are things that will try to get in your way during your games. Some examples would be lava that jumps out of the ground and Thwomps that will try to crush you. Try to avoid those fields when playing in multiplayer.
There are a total of 12 characters to choose from. You start out with 9 but you get to unlock one in each cup you beat for Domination Mode. Each cup has more rounds and gets harder as you progress. A problem in this game is the AI. You start the game with fair AI, but as you progress into the Crystal Cup, the AI becomes way too cheap and the Crystal Field is unbelievably cheap. The cheapness of some fields is what made me lower the score of this game.
What makes this game really great though is the Wi-Fi. You can choose to play with either your friends or ranked people. There is an online leaderboard that resets itself each new season. They also show the Striker of the Day which is the person that got the most points in Mario Strikers on that day. Wi-Fi makes this game really competitive and what makes this game really great. This is actually the best Wi-Fi game on the Wii so far.
If you have a Wii, try picking this game up. Though think about it first as you might not like games that will most likely make you swear at your T.V. at difficult times.