1.0-2.0:    If you are just starting to play and understand the rules of pickleball. 

2.5:    If you have limited experience playing pickleball, you can keep a short rally on the pickleball court, and you have a basic understanding of the rules of pickleball.

3.0:   If you can hit forehand drives, serves, and returns with some pace, but lack consistency and control. 

3.5:   If you can hit drives, serves, and returns with some consistency and control. You are starting to vary your shots, and moving to the Non-Volley Zone line at times.

4.0:   If you can hit both forehand and backhand drives, serves, and returns, as well as dinks, drop shots, and volleys with consistency and control; and you have a moderate number of errors.

4.5:   If you can hit both forehand and backhand, serves, returns, dinks, drop shots, and volleys with pace, spin, depth, direction, consistency and control. You have a limited number of errors.

5.0:   If you have mastered both forehand and backhand, serves, and returns, as well as dinks, drop shots, and volleys of different speeds, and have consistency. You have mastered the strategy and rules of pickleball, you rarely make errors.

5.5-6.0+:   If you have mastered all shots and strategy; you are consistently winning against the best professional pickleball players at the tournament level.

Rating system via: https://thepickler.com