Saw it yesterday. It was good, wasn't mind-blowing but wasn't terrible like GB 2016. It absolutely was a love letter the the series as a whole and to Harold Ramis, I legit had tears at the end and no shame admitting that.
Crazy to think the last GB film I saw in cinemas was GBII back in 89 and that was my first film I saw in cinemas when I was 4 years old. I'm interested to see where they take the series next.