A creative twist
I believe people who are rating the game to harshly based on their first experience playing. The 8 playable classes add depth to the game. Some may be stronger than others, but it is possible to use most of them effectively.
I do wish I could have seen more variety in the boss battles. It takes not skill to defeat them. Overall it boils down to pressing the a key as fast as you can.
Play past the first level and discover all the classes. If you enjoyed rage you may find this a creative way to implement the gamestyle.