I've been playing it pretty steadily, but it feels like the number of fights it takes to make a level keeps going up. Sometimes I get the feeling that the authors of the game are continually increasing the level-up requirements to encourage players with low or no pupil counts to drop out.
I think as you level up, it is apparent how important it is to start with a 'good' brute, cause the disparity between my brute and almost everyone I see is insane. I don't play much anymore as my access to broadband is now very limited....