I've posted my review, link is in my signature. It's not my best review ever since I'm tired, and I think I'm making standard points.
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Batman wasn't just going crazy, he wanted to kill Superman. He built a Kryptonite spear, and he has kryptonite bullets, he's in a murderous rage and then all of a sudden he isn't and he refers to Clark as his friend a few minutes later.
It would have worked better if Clark had *done* something to earn that friendship, as in save somebody in front of Bruce so that Bruce sees him in a better light, or stop Bruce from doing something bad.