I'm like you and haven't played any of the games (except rc pro am). I found a youtube video that has gameplay from every game included. Made me realize it wasn't for me. You could look it up.
This is more or less what happened with me (I actually used to have Super R.C. Pro-Am on the Game Boy), except I actually bought it on release. I figured I'd have a lot of fun with it since I loved the Genesis collection from last gen and thought this would be more of the same type of experience - except it turns out I didn't really like 90% of the games here. I also hated the fact that the newer gen titles were actually just Marketplace downloads, adding another layer of annoyance to even just trying to play them. Wish they would've added some filter options and the like, too, but that's me being picky as usual.
Not saying the game sucks, just was definitely not my cup of tea. More power to you if you love it.