i agree with everything you said there. These two could surprise me and pull off a great movie, its just that, they are both unproven and when they had a chace before to make a serious movie like Hulk with action in it, they blew it. Thats what worries me.
Most great directors were unproven at one time or another. Does that mean I think all bad directors are going to make it to the top? No... not really. But I do think LL is onto something, as he has more talented actors, and a much bigger budget than ever before for him.
All LL has to do is basically combine the seriousness of Danny the Dog, with the action of his other films, and I think he's onto something. (Just my opinion.)