Just got back from it. Need to try to organize my thoughts on it. Will try to avoid spoilers, but the more you read, the more likely you are to get spoilers.
I loved it so much that I will probably have to go see it again this weekend. It is impossible for me to analyze it objectively as to whether it is a good film for the various things that make for a good film because it found every button I have and pushed it.
Nostalgia. But well executed. It stayed true to the original movie while giving it enough of a twist to keep it fresh(ish). The concept of the misfit with the boring, mundane life, who finds out a secret, magical life they were destined to. Scenes where it looks bad and like someone's utterly alone and failed--when they find out they *aren't* alone and someone's got their back after all.
The casting was great. The story leaned heavily on the original movie but in a way that was mostly entertaining without being TOO slavish and derivative. The writing gave us likeable characters and gave each of the characters enough to do. The girl is the science geek. The boy is good with cars. There really aren't any characters that are just in there for no reason and with nothing to do to advance the plot. And the plot moves along without getting too bogged down at any point.
That's a gripe of the Craig Bond films for me. I generally *like* the Craig Bond films. But it seems like he's always the retired/rogue agent. So they have to spend a huge chunk of the movie just getting Bond involved. In the earlier movies it's just...Bond comes into the office. Moneypenny says M wants to see him. M tells him the mission. Maybe Q gives him some gadgets and we're off. The latest one starts with a flashback to Bond's girlfriend's childhood. Then we get a flashback to when Bond broke up with his girlfriend. Then we finally get to Bond, living the good live, retired in Jamaica. Then we have to set up a conflict between the CIA and MI6 and a new 007 until we're halfway through the movie before we even get to the movie. The have to spend so much time getting Bond on the mission that they have to cut corners on the rest of the story. This one, they get to the point: A family of poor misfits have to go deal with the estate of their dead, estranged Dad/Grandfather. The main reason is to get the money. But it turns out Grandpa was broke too. So life sucks. But then it turns out Grandpa was a Ghostbuster, ghosts are real, and Grandpa wasn't really a bum who abandoned his friends and family for selfish reasons. He abandoned his friends and family for selfless reasons. Everyone plays their part and gets to an ending that is admittedly pretty heavily derivative of the original movie and they make some pretty blatant and sappy decisions about how to deal with Harold Ramis being dead, but they did it pretty well and I enjoyed it.