One time event here. I don't want to write up issues with games as I am a software tester to make a mediocre living.
Your EXP leveling system is too steep for the reward.
1.) Create account anonymously.
2.) Play games (draw or caption, whichever you feel you can get the best results in) applying varying skill levels from best effort to worst effort.
3.) Wait for games to finish.
4.) Tally garnered reputation or EXP points.
5.) Notice how long it takes to gain one level.
Note: I suggest giving players a set number of points for a game being completed to help them progress even if they lack skill or popularity to get votes quickly.