i do. for some matchups you're right, it doesn't matter too much other than helping your rushdown and getting in become easier and better respectively. it can also help in baiting pushblocks and covering holes while still having another bat after it's used up. but against black adam, say, i feel that trait does a lot for him in that match because it makes black adam have to respect you much more and he can't play his game like he can against most of the cast when you manage your bats correctly.
these are just my feelings, though, and i respect your opinion. also, i don't main batman but i use him in a lot of matchups because using grundy in those makes me want to rip my face off.
i also don't mean to say he doesn't have anything else or is garbage, but without them he is much weaker in my eyes. if he had better strings i might feel differently.
as far as MMH is concerned, his trait is really going to help with both pressure and defense such as when you have the life lead or maintaining corner pressure. it's early, but i think his trait is one of the best things about him.