Wally pretty much summed this trip up. My only difference is that I don't think the overall wildflower scenery was substantial. Substantial in pockets maybe. The burnt and fallen tree count was substantial.
The views on the Mazatzal Divide trail are outstanding, wow. It was slightly reminiscent in a way of hiking the Grand Canyon with the views below you into the canyons and the towering cliffs above. The best way to do this loop is clockwise until the Y-Bar trail gets cleaned up a bit from the fire and all the fallen trees.
The total distance on this seems to be much closer to 14 miles rather than 17 or even 15. We did it in about 7.5 hours, including lunch, pictures, BSing with other hikers, etc., and I don't hike that fast. The waterfall seemed to be flowing slightly moderately, so we didn't go back further in to check it out. The stream below did give nice views with the pools and falls on the way back to the trailhead.