I liked it a lot. Personally, I think Mcduffie writes really fun comics. Maybe not intellectual comics or classic comics, but they're a blast to read.
The one problem I had was that it was a bit too tongue in cheek with the allusions to Justice League Unlimited. I mean, we all realize that Mcduffie was the writer for the show. He didn't quite need that many references to it though. It was a bit too cute and didn't really feed the story well: John Stewart's soulfull look at Hawkgirl, for instance. Unless he does something interesting with Roy and John distrusting each other, I didn't find that referencing his own creative past is the best idea. Further, the Hall of Doom? I mean, creative allusions to previous media is fun, and if McDuffie is intending to make this a metatextual look at the depiction of the League in television and a celebration of the various forms the League mythos has taken, that's cool. but I think he can do a lot more with the JLA than just that.
For the most part though, a very fun issue, and I'm excited about what he's going to be doing with the league. Hal and the X-men themed strippers was funny- I liked his uber competent but friendly version of Batman- I mean, the league are Batman's friends. It may not be very Batman-ny, but combined with what Giffen is doing in the Four Horsemen special, it's nice to see Bruce as a person- albiet one with intense social problems. It's like those times when Batman's nice to Robin- everyone loves those moments.
You can tell Mcduffie has both a real feel for the history of these characters, and a real love of them. Didio talked about how comics after the Crisis were going to be fun again, and this is a good example of where DC is finally doing that. The issue had dramatic tension, it wasn't childlike or pandering, the villians seem frightening and powerful and evil rather than sophomoric, but the heroes acted like... heroes. and that was a great change of pace. They seem like real people- drunken Roy, Batman concerned about Diana, Wonder Woman and Hawkgirl worried about Firestorm. But they don't seem like gods or people whose wives will kill each other if you turn away for a second or will mindwipe villians as a punishment. all in all, this issue gave me some good hopes for where Mcduffie is going to be taking the book. the art does need work though.
(or maybe it's just that after the god-awful Meltzer run it's nice to see the Justice League doing ANYTHING other than sitting around at a table and calling each other by their first names while in public, in front of their enemies. C'mon, Meltzer, they aren't idiots. Plus- no Red Tornado. And no one likes Red Tornado. That guy's a b*tch).