I see this on sale and I'm just wondering, for someone who just wants a casual baseball game and the last game I played was EA's MLB game, is this casual friendly? I mean, outside of that RBI baseball mode of course.
I would say so. Besides Retro mode, they have added some tutorial tips at the beginning of the game to help you get started.
You can choose "directional" hitting at first so you don't have to aim your bat and it's focused on timing, pitch location, and player stats instead. The pitching modes are pretty simple (except for analog), so pick what you like best there.
Once you get a handle on Beginner difficulty, I would recommend switching to dynamic difficulty, which "levels up or down" as your performance increases or decreases.
In settings, you can also automate base running, moving the fielder, and throwing defensively as you see fit.
As long as you take a few minutes to get your settings right, The Show can be a very rewarding experience, even for casual play.
Edit: One thing I will add is that there is no option for automatic substitution/bullpen management, a feature that Power Pros had that was nice for beginners. The bullpen management is fairly simple, though.
When you start noticing your pitcher getting tired (his energy meter will turn from green to yellow, then red, and you'll get messages at the top of the screen), press up on the d-pad and select bullpen, then select a pitcher to warm up. Check in on them every batter or so when first playing to get a feel for how long it takes to fill the warm up meter. When their meter is about 3/4 filled, select the pitcher and choose "ready and waiting" so they don't wear themselves out if you're not putting them in right away. "Stretch and toss" will get a pitcher slowly warmed up to half way ready at max, and is good for certain situations.
As for batter subbing, while it's not mandatory, if you're not familiar with double switching, I would recommend playing with American League teams at first. Double switching is hard to explain, and it took me a while to wrap my head around it, so when you're ready, look it up and play some practice games with National League teams to try it out. As I said, it's not mandatory, but very useful in certain situations.
Anyways, sorry for rambling. Hope this helps.