I think he's a really good character, I have appreciation for the patch notes. But I have a really big problem with up batarang. I haven't played against him after the patch, so this is pre-patch experience. I'm really good at blocking batman and all, but his up-batarang is considered to be a high, but when meter burned it becomes a +19, combo launching, anti-airing (that even hits behind/beneath it!) sphere of death that jails into f2 if you don't have a good enough backdash. And even if you do, you reset the neutral, which bats control SUPERBLY well. I think up batarang needs some changes, and I'm not saying to completely destroy it.
I would only make up batarang MB cause block stun after a blockstring and to not affect grounded opponents if they haven't been affected by a block string or hit string. That way, it maintains its anti-airing properties and his frame advantage in pressure, but won't be a huge "why not" move in the neutral just to ignore the fact that Batman has really short-ranged normals.
I think post-patch I won't be seeing as many MB up batarangs just because Batman will have to be a bit more meter intensive if he hasn't been in, dealing pressure (which builds a LOT of meter). But, I think it may need to be addressed in the future if this patch doesn't handle it.