The game looks great in DX9. Yes, it's a shame that DX11 isn't playable yet (at least for Nvidia cards), but the experience is still great on DX9.
Personally, I knew I would play through the game at least twice, and by the time I'm ready to play through the story a second time, the DX11 issues will be fixed.
I just finished the story this weekend, and it was even better than the first, which is saying a lot. I was a bit worried that throwing so many side characters into the mix would dilute the story, but it works. Rocksteady should have made sure DX11 worked out of the box, but one major goof won't detract my enjoyment of an otherwise stellar game. I really hope the series continues.