I've been playing a ton of this game lately. I only play RttS, no franchise or online.
I was having issue with batting so I went looking for some answers. What I've found that helped me was lowering the pitch speed in the sliders. I knocked mine down by just one notch and my average this weekend has gone from .219(lol) to .280. This is after coming in with over 200 AB's before the change to pitch speed.
But I really think that the reason hitting is such a challenge in the beginning of your career is, basically, because you suck and need to develop your skills as a player. It's more realistic this way IMO, if you have the patience for it.
Stealing is much harder this year, even on rookie. But I don't really care for the new run mechanic using the stick.