Why are you complaining so much.. IT'S A BETA. It isn't guaranteed to be PERFECT. From a few hours of gameplay, I can see it has improved a lot of things, such as an option to support multi core processors, a feature similar to that of TF2, which will obviously take full advantage of modern processors. The new engine also makes the game look a lot better.
As for netplay, what Xeno said basically about hitboxes and reg, I can actually shoot someone in the head now and it counts as a registered hit.
I think it's good that they dusted off CS:S a bit by throwing in achievements and the random statistics, makes the game a lot more fun to play in my opinion!!