This game has some really clever ideas and fun puzzles, but the heavy use of the Wiimote's motion controls is its downfall. The controls simply do not work consistently. You might be making a motion to do something one moment, but then the next it abruptly stops working and flailing your arms around is about the only thing that you can do. If a game is going to make such use of the Wiimote, it has to be perfect to be fun. Zack and Wiki is far from perfect.
There is also the issue of arbitrary dying. How fun is it in a puzzle game to die (!) by no fault of your own and then have to replay large portions of the game or spend in-game currency to purchase platinum (a.k.a. mulligan) tickets? Usually the levels devolve into trial-and-error as you find out what kills you and then trying to work around that on your second, third, etc., try.
I really wanted to like Zack and Wiki after reading good reviews about it. But it seems for the time being only Nintendo is capably of making decent games for their system.
Zack and Wiki is a half of a great puzzle game. For the first half of the game, you guide Zack through a series of stages solving point and click puzzles. The stages build in complexity, but are essentially linear. These early stages are engaging, fun, and leave the player satisfied with finding the solution.
The second half of the game goes steadily downhill. All the skills and techniques learned in the early stages are steadily abandoned. By the time the player reaches the final stages, the game becomes trial and error with terrible consequences for failure. Point and click games are fun the first time through -- but when forced to replay a level multiple times through while learning how to solve the last puzzles at the end of stage, the game becomes excruciating.
You can buy hints and extra lives, but these must be used sparingly. Money to purchase the extra lives is very short. Perhaps there's a way to earn more money during the game, but I didn't find it.