While I disagree with some of Warren's theology, I admire Warren's willingness to give so much of his money back to the church. I certainly don't think it makes him any more virtuous than somebody else who is wealthy and tithes 10%, but in a country where less than 3% of church-goers tithe it's encouraging to see.
It is good that he doesn't hog the money for himself, unlike others like Joyce Meyer etc.
I think the guy has a true heart for God, but he just plays too sloppy with Scripture.