Interesting idea. If it gets some wider attention on the board it might be a place where you can show the results of particular set-ups you tried, so others can see the results, and you can discuss them.
Only big thing I see is that gear/gems/reforging matters quite a bit in this, and there is no way to get a permanent link to what set up a user had when the logs happend. Might be an idea to have people also include what (approximate) ilevel and what stat priorities they used.