ESSM is a great movie. I think to apreciate it you've had to love and lost before sometime in your life. Maybe some of these people just haven't been through that.
As for Carrey not doing comedies, I think we all deserve the right to do whatever we think is best in our careers. He has earned the right to make whatver movie he wants to do, which I know a lot of people would love to be able to do!
And plus, can any comedy he makes now be "as good" as his earlier ones? People will constantly compare the new one to the old ones, and it will never measure up. Just look at bands like u2 who have put out a lot of work, and the newer stuff is never heralded to be as good as the old stuff.