I dunno. I think it's unfair to say Tomasi always has Damian's voice off, it's sort of a mixed bag for me, sometimes he gets it right, sometimes he doesn't and so that gets a little jarring. It's like this preview, most of it is fine with Damian's dialogue, it just inserts things like "yeah", "geez", "too bad", common enough phrases, but they're not stuff Damian would say, he's not a common or normal kid.
Maybe it doesn't bother some people who are just thinking I and other people are being a little too obsessed about this, but Damian is my favourite character and so yeah I guess I take this pretty seriously. You wouldn't have Ra's Al Ghul go around greeting people with a "hey dude".