The anthropic principle is actually the opposite - it's an objection to the fine-tuning argument that says something roughly like "well, of course the universe is configured in a way that allows us to be around. if it wasn't, we wouldn't be around to discuss it. thus, there is no need to appeal to an intelligent designer of the universe to explain its fine-tuned nature."
That aside, with respect to saying an intelligent designer designed the universe ("God did it"):
>explains nothing
Well, it explains why the universe is fine-tuned, if you buy the argument.
>predicts nothing
Yep, just like any other answer to the question, since it's a metaphysical question rather than a scientific one.
>satisfies no curiosity
It offers an explanation.
>closes the book on any further questions
No more than any other answer does.
That aside, with respect to saying an intelligent designer designed the universe ("God did it"):
>explains nothing
Well, it explains why the universe is fine-tuned, if you buy the argument.
>predicts nothing
Yep, just like any other answer to the question, since it's a metaphysical question rather than a scientific one.
>satisfies no curiosity
It offers an explanation.
>closes the book on any further questions
No more than any other answer does.