The concept of the opening was fine, the execution was just kind of shit. Like...the timing/directing is great, the actual art they used was really lame? The only good parts were the CG (like the part where old Bruce rotates into the camera really fast).
The part where Batman's supposed to be looking really badass while doing kungfu moves is pretty lame- he just looks like he's waving his arms around aimlessly.
If I were to be pickier I could say that those words were really lame too. LOLOL HONOR LOLOL HOPE OH MY GOD THIS CARTOON WILL BE SO EPIC!!1
I have more weeaboo reasons for not liking it, too, like how I plain don't find the latest angular bullshit cartoony American art style to be attractive, and thus found the entire "omg sexy dance scene omg sexy chick looks up at you" part really disgusting and cartoony but you could say the same sort of shit about animu so I'll stick to the less subjective reasons.