The overhead launcher has 28 frames of startup.
Reiko and Sub Zero have Rain's d+3 (as d+4) except their version is -6 on block. Rain's d+3 is -12 on block.
Lots of characters have very good anti-aerial attacks in this game. Besides, why jump on Rain? All the projectiles are slow and can be flawless blocked.
I agree that standing jab and f+2 are good, but how do these moves complement Rain as a "premier zoning character"? They really do not.
Reiko, Shang Tsung, and Sindel have access to far superior projectiles, and their up close game is as good as, if not better than, Rain's.
I agree with
@exeeter702 . My initial impression is that Rain appears to be one of the weaker characters in this game. I hope to be proven wrong because I really want to use him. He is the primary reason why I purchased this game. I love Rain's character design, and when I heard that he was going to be a "premier zoner", I was ecstatic.