I am very, very disappointed with the changes.
I am an extremely competitive person so I don't even like it that much when I don't feel like I'm doing well in LFR. Granted that might change, I did my first LFR yesterday with my chi trackers broken and having no clue how much chi I had the entire time and realizing last night after raid I've reforged my haste cap incorrectly a few times due to reforge sites not working right. However, I realize when before 5.1 I was outhealing other healers in LFR by 10+% that the class needed to be nerfed but I think they've gone too far with it. I have always been a skilled healer on any class and when I'm now struggling to overtake disc priests and some resto shamans in LFR I feel like they've nerfed mistweavers to the point that skill can't make up for it. On the contrary, disc priest (which was my main in Cata) has been buffed up to insane levels.
That being said, my 10 man guild raid last night seemed fine for the most part, but I was healing with a holy paladin and resto druid so...who knows.