Edge is right on when he says that you have to pay attention to your opponents. As much as it would be nice if we could determine optimal playing strategy as a function of oppenents' x/y/z, and finding an optimal x/y/z of our own, the fact is that there is much more to a player. x/y/z is only scratching the surface. Your personal x/y/z will be a function of the types of games you are playing in, but when you are playing, you aren't thinking "I need to play this had to achieve my target x/y/z." Instead, you are hopefully thinking, "my opponent's x/y/z combined with the way I've seen him play prior hands indicates that _____ is the highest EV way to play my hand."

Regarding evaluating your own play, the most important statistic is ultimately the performance one, your BB/100. Unfortunately, this number doesn't converge until you've played at least 50,000 hands (more like 100,000+). I imagine there is already stuff posted somewhere on this topic, but if anyone is interested, I can post a calculation in a different thread showing why you need so many hands for a reliable BB/100.