My opinion is almost opposite yours.
Batman having a son seems weird, I'll grant you.
And his unquestioning acceptance of said son is also weird.
Otherwise, though, I loved the story!
Talia blackmails Kirk Langstrom into creating her an army of ninja Man-Bats, who attack a vacationing Bruce Wayne in a comic art museum.
Almost an entire issue of Batman brawling with ninja Man-Bats, then he gets captured by aforementioned freakin' ninja Man-Bats and taken to Talia, who apparently has gone all-out evil.
"Hey, Bats! remember that one night? Where I drugged you because you didn't want to give me the perfect kid?"
"Say hi to Daddy, Damien!"
"HOLY CRAP I have a KID???
We move to the cave where, while Batman's out fighting crime, the aptly-named Damien:
(1) mugs Alfred
(2) beats the crap out of Robin
(3) sneaks out and cuts off the head of some supervillain to prove his awesomeness to Batman.
Batman says, "okay, this is crap. You're going back to mama."
Kid says "Bummer, I was just getting comfortable."
He drops li'l D off on the Rock of gibraltar, which Talia has just coerced the British government into giving her. Then the British army blows up her submarine, and Batman goes back to Gotham. And I go to change my pants because I peed them from sheer joy.
Ninja man-Bats make everything better.
So yeah, I loved it.
The weird, semi-prose issue was lame though.