I like the idea. It can help to see if you follow your priority system and how to improve.
However there are some things that would help to process the information. Like how much rage do you have. But I do not think that that could be integrated well.
I would like to see something like buff/debuff-uptime, too. So if demo / TC / shout dropped or is nearly finished. Or at least TH/SW CDs.
At the moment you do have many encounters where you can do a good round rotation. But sometimes you have to delay abilities for special cases (like SB to smooth something or TC/SW to grap hold on some adds or interrupts, or applying rend because of an air phase...).
I hope they get more encounters that forces you to do stuff beside your rotation. Anyway even than it is a good thing to see what you are really doing and what you could improve to integrate other actions in a better way.
I do not think I would use it regularly but that it would be a good tool to check my performance, the performance from new tanks or help learning a new rotation / priority system if things change.