I absolutely HAD TO HAVE an ADR to 1900 PF, despite the reviews.
We liked it quite a lot. Honestly, I have no idea why there were so many negative reviews.
I will say that there's nothing revolutionary about the food. It's not overly remarkable, but I had several tasty things and NOTHING was even remotely bad ... or not warm .... or not cold (as the case may be). I found plenty of things to try and went back for more on some.
Service was fine, and like others have said, the character interaction was IMHO off the charts fantastic. The pictures I have from that meal are some of my favorite EVER from WDW. FYI - my daughter is not easily scared and looked forward to meeting the characters. I even encouraged her to say, "Your dress is pretty," to Lady Tremaine (stepmom). Without missing a bit, Lady Tremaine said, "Of course it is," in SUCH a haughty way. It was a great experience.
Haven't ever eaten at CM, but those are my 2 cents about 1900!