I understand that tennis is a difficult sport to learn. I play a lot of sports and I would have to say that tennis is the most difficult by far, maybe because I'm learning it at such a late age (26) than when I started learning basketball (couple days old). I'm not looking to become a pro though. I know it takes time and practice to refine one's strokes. I play on average once a day. During the summer it can be 2-3 times a day. I can analyze myself on the fly and figure out what I need to improve during a match. I do understand that for most people doing this is hard, but there are the few exceptions who can pick up a racket, take a few lessons and do what I've done.
As far as the technical skills go, it's no doubt that the technical skills will not help you win matches. I mentioned this earlier, but some of my strokes are 4.0, others are higher and lower. But the most important thing in tennis I think is one's mentality. If you chase every ball, if you never ever give up you can do more damage to your opponent's psyche than a dominating serve or forehand could ever do. I see so many of my opponents get demoralized when they execute a text book drop shot when I'm at the baseline, only to see me chase it down and flick it back over. This tells them that they need to be a little more perfect with their shots and puts them in a uncomfortable situation. They then try to be too perfect and start hitting more unforced errors which then just destroys their confidence and allows me to take over.
I think one should look at their mentality before looking at this rating system. You could have the strokes of a 4.5-5.0 player but if you can't hold it together mentally then perhaps you need to drop to 4.0 or lower until you fix that part. The mental game is the least worked on part by most players and it shows in tournaments when things don't go their way. But that's for another thread and I'm too lazy to start one. Have a good day everyone.