'Freaky Friday' is awful in every way, a complete embarrassment to its namesake. The daughter character has no redeeming characteristics -- she is lazy, dirty, socially handicapped, and is completely devoid of empathy. She treats everyone around her like they are sub-human. They took the teenager trope way too far and created a character the audience could never root for, and it is not believable that the other characters like her.
The mother character also makes no sense. No adult would have such a flawed memory as to go into high school so naive, starry eyed, and earnest. She also seemed to lose her ability to take social cues when she switched bodies. I'm not sure if the writers themselves have ever been to high school. I also do not understand why the writers thought it was a good idea to give her a crush on a 14 year old boy.
The songs are exclusively terrible and so long it becomes awkward, honestly not sure why it was a made a musical. There's no reason to say anything more than that, the musical segments have to be seen to for one to really understand how abhorrent they are.
So, why did I give this movie a 2 instead of a 1? All the problems I listed above combine for a special kind of awful. This movie is hilarious, from the bad lip syncing and singing down to the irrational and suspension of disbelief shattering level of unrealistic behavior the characters exhibit. At around a 70 minute runtime it is the perfect movie to watch when you're bored and looking for a laugh.