The critic reviews are too harsh....Overall, an awesome game.
The Good: The game offers a unique feel and is certainly unique in concept. The combat system is well-done, and the scorpion's finishing moves are awesome (if somewhat twisted) and provide a sense of satisfaction. The motion controls are also very responsive and accurate (at least, at my sensitivity level - just slightly above normal). The boss fights are a lot of fun, and are certainly humbling to encounter. There are lots of secrets, nooks, and crannies to explore, and the visuals are very nicely done. You certainly get the feel that you are, in fact, an arachnid fighting for survival. The dark storyline also keeps you going until the end, though it is a little spread out...
The bad: The game occasionally has drops in frame rate, but it's nothing major; more of a slight irritation than anything. The game could use a few more of the epic boss fights and an improved ending, as well.
Overall, the game does very well as a Wii title. I would recommend this to anyone who is a fan of the action / adventure genre. It's not without its flaws, mind you, but the unique feel and fun of the game make it one of the best titles I've purchased on the Wii.