The Good: Back in 2013, Frozen became a bona fide phenomenon, on the level that I honestly can't recall for an animated movie. Watching this 8 years later as a grown adult, I can say that I totally understand why this movie became a phenomenon.
Frozen has three big things going for it...the songs, the characters and the interesting subversion of tropes. I personally don't *love* all of them, but the musical numbers give the movie a bouncy, fun vibe. The characters are lovable and well written; it's hard not to like SOMEONE here, if not the entire roster of characters.
The Bad: I don't think the movie does a great job with establishing the central conflict. Despite the first portion of the movie covering it, by the time the movie gets into it, I just didn't buy the relationship between Anna and Elsa until the halfway mark of the movie. Anna's motivations are quite poor and while I get that we wouldn't have a movie without this central conflict, it could have been communicated with a bit more patience.
This might also be a nitpick, but I also felt the environment lacked a real presence; Arendelle sort of gave me "Asgard" vibes, which means: devoid of people, we move on from it too fast and it doesn't feel like a living breathing world. Maybe it's the cold setting, but I prefer my fantasy worlds to be brimming with life and character.
The Ugly: Yeah, it's good. I still think Let It Go is a bit overrated and I've definitely seen better looking animated films, but Frozen is a solid movie and fun for the whole family.