Went on Mystic Manor around five times today and here's my initial thoughts. Great original dark ride with amazing effects, cool story, great AA, though ride is a bit "smaller" and linear than I was expecting. Pre-show formatted similarly to Haunted Mansions elsewhere though no ceiling effects and mainly just projection with AA monkey.
**Tips for new riders - Sit in car 1 or 3 for the best experience as they enter most of the rooms first so the effects are not spoiled. ie) The Chinese room at the end, if you sit in car 2 you essentially miss the entire thing. There's one section in the middle where cars 1/2 go one path where you see three armor animatronics and machine arrow targeted at you, which is better route (there's hiddden mickey on his axe), and cars 3/4 see a single armored animatronic before moving onto new room. Car 4 has one advantage in you're the last one out at the end of ride and the monkey says bye to you.
So ranking cars from best-to-worst I'd say Car 1 (see rooms first, get better path in middle split), Car 3 (see rooms first, worst path in middle), Car 4 (get to see monkey say bye), Car 2 (get better path in middle, though last in chinese room so basically see nothing).
Also wondering for those that have also been on Hunny Hunt how you compare. For me, overall I was more impressed with HH first time I went on, mainly due to the randomness and scale of the ride which I thought was bigger than MM. The final room in HH (huge room compared to anything in MM) where there's like 10 cars all going different directions was awesome and MM never had that type of feel. HH also had jumpy cars which MM did not have.
However, obviously the effects in Mystic Manor were top notch, especially with the AA, pixie dust and Chinese room effect with wall breaking off which is pretty cool. This is by far best ride at HKDL (GG just too slow for my taste) and beats any dark ride in US, but overall wish experience was more consistent across different cars and the scale was just a bit bigger.