Not the first time, but guess I was somewhat in the minority.
First, it's another "look how smart the kid is, smarter than the parents!" movie. Not sure why Hollywood keeps thinking that's what people want, but it keeps happening. It's just lazy at this point.
But my bigger issue with it was that it lacked the humor of the first one. They call it a comedy, and I guess superficially it was, but doesn't even remotely compare to the original in that regard. How many laugh out loud moments were there? The original had so many classic lines, is there even one in this one you will remember? It also lacked the purposeful zaniness of the original, other than where they copied it (and the copying was fine, that's what people wanted).
That said I didn't hate it, lots of great callbacks and clearly lovingly made - really liked the last 20 minutes or so. Just thought it could have been more.