There's this glitch when you reach LVL 15 that you start to lag a bit and stay inside. And the MIKARIMELODY'SENERGY.EXE Has stopped working, and the multiplayer just has jerks with microphones screaming at their moms for more red bull. And the AI is AWFUL! If you pull out a missile launcher or Katana, YOU GET SHOT by a COP. Although Meleeing the shit out of civilians is fun. 3 stars.
Yeah, I never could figure out the leveling system either.
The K-12 levels were pretty episodic with shiny stars and a letter grade reward system. The bonus college level was really cool to play, especially the MA rated parts. However, the mix of having to spend monetary points you didn't have to play the levels only to have to earn a letter grade reward at the end felt like double jeopardy. After the college levels, the "rest of your life" levels have no direction. There are no letter grade rewards and the monetary point system is stuck trying to make up for the college levels.