I love Morrison, but I've never been all that big on his JLA run, there's some good stuff in there, but nowhere near the quality of his work on New X-Men, the only time I've ever spent money on an X-Men book (and this is coming from a DC guy). To be honest, I've always had ambivalent feelings about the JLA as a concept anyway, probably because it so clearly reminds me of the "shared universe" thing that has been an albatross of the superhero genre for decades..
Also, that lineup is fucking lame. It's like DC said, "Hey, let's try and see how many books we can't sell".