My only problem with the system so far is that, as far as I can tell (and I've only chosen and managed Fastpasses on my PC, not the app), once you make your three choices and choose times, there no way to adjust the times of all three picks on the same page. You have to do each one separately, and it gives you limited times you can change them to. I think you should be able to change them more dynamically - ideally you'd have a page with ALL the possible time slots, and be able to drag and drop the three attractions where you want them, switch them around, etc. It seems very cumbersome to change the order of your choices, move them all from the morning to the afternoon, etc. Or am I missing something and this is easier than I think?
Also, the times it suggests to you - the optimum ones or whatever it calls them - are sometimes morning, sometimes late afternoon. What is it basing it's decision that they're the best times for me on? I know ADRs are a factor (and it's sort of annoying that it factors them in and makes you avoid them), but ADRs alone don't account for some of the extreme time choices it suggests.