I messed up my RTTS experience this year a bit, because I doubted my own skill at the game. I... thought I'd get taken out behind the woodshed if I messed around with the higher difficulty levels, so I stuck with rookie, and ran with it.
Had a great time in the minors... apart from one of the worst slumps ever I mean, that was a rough patch... but for the most part, it was good.
After I got called up, I... smashed. Hit like 75 homers my first season, and notched somewhere around 80 my second. Stickler for realism that I am, I got a little too deep inside my own head over this.
I've found that playing with hitting set on Veteran difficulty and pitching set to All Star is the perfect match for me, and it's been pretty all right for me since then. Have a rough patch now and then, but for the most part, it's good.
I do wish I could play around and have multiple RTTS games with different characters though. I love creating characters, and I had a couple in 20. I had a blast in that game. I had my shortstop... well, my left fielder that I wanted to be a shortstop... who became my ballplayer in 21, and I had a starting pitcher I really liked as well.