without going into a 4.0 being 'real' or not...
http://www.youtube.com/watch?v=MaazJs35qCU
a rough count of how many shots on average they can keep it in (less the missed shot, and less the serve).... the average is under 3.
that's what 4.0 is!
so of course that video with Mr. Shirtless is legit 4.5
LOL. The guy serving in the blue at the start of this video was 21-2 at 4.0 singles last year, including going undefeated through Districts, Regionals, and Sectionals for a team that was one match from Nationals. He was bumped to 4.5 (obviously).