I'm an 'old' XBOX guy and new to The Show. I had the opportunity to be a part of the Tech Test and have been able to play around with game. The hitting is just plain difficult. But that is true of the actual game of baseball. It is said that hitting a 95 mph fastball is the most difficult thing to accomplish in sports. I agree with most here that it just takes practice to improve and while I still don't consider myself good by any means, I have improved. When I get frustrated, I switch to Dynamic Mode for hitting and let the game show me where I am (it will increase or decrease based on your performance). If I get dropped down to Veteran (or sadly sometimes Rookie) I play there for a while to get my confidence back and then level up to take my lumps!
The main thing is that I am entertained and that is (IMO) what a GAME is supposed to do, Entertain!