Seriously, he got [parasitic bomb] on majorly.
He was the one who got most damage, the most falls, and the most stupid "battle tactics". What the [tornado fang]?!
I mean not even he's invincible, but to be that [tornado fang]ing lame in the series opening, that's just pathetic.
He's like this in Justice League
and Unlimited, all the [tornado fang]ing time. It's like Pyro said, it's because of his invulnerability. They love having Supes take 70% of the physical damage in battle.
On another note, I think Batman is severely underplayed in JL and Unlimited. He has some cool moments, but there aren't nearly enough hand-to-hand combat scenes or scenes where he invents something useful to counter an enemy. While he may be a part-time leaguer, most of the others take up way to much screen time.
However, I am extremely glad they gave him moments such as when he stayed with Ace until she passed away or the "Epilogue" episode.