The only comics Grant Morrison wrote which I enjoy are All-Star Superman and his Vampirella issues with Millar. WE3 and those three issues he wrote for Spawn were alright. Seven Soldiers was just disappointing. I truely hated Batman R.I.P. and everything that lead up to it. Remember that horrible issue 663 with the ugly prose and even uglier art? I could not even bother with Final Crisis, I just stuck with Johns' great Rogues' Revenge. Batman and Robin I'm on the fence about: the first three issues were good, the last three issues were not so good. I wasn't impressed with Joe.
My brother read his entire run of New X-Men on his winter break and said it was okay, which for him means pretty good.
Seriously, dream director for this: David Cronenberg. He could handle the gore and dark humor effortlessly, plus he would cast actual actors in the roles rather than just movie stars. And I hope the movie is closer to the first issues Garth Ennis wrote than the game which was more going for the tone Paul Jenkins had during the 2nd volume.