The movie is just stupid fun and I'd say that's its charm honestly. It doesn't try to take itself too seriously, the CGI is meh of course, the story is serviceable and the acting is pretty dope from all parties. Again, it's stupid fun. If you want a movie to watch with your friends (which in my opinion will be even better if they're also Smosh fans) to kill time one day or if y'all got nothing to do, watch it. It's enjoyable and at the end of the day it's two dudes just having fun doing what they like and what they do best: Entertaining people and making them have a good time.
I do understand however, why people that have ZERO idea what Smosh is to begin with wouldn't be fans of the movie or like it whatsoever, but their content (both old and new) is fun and I recommend watching their stuff too.