This is the main problem I have with this movie: It is not what it says it is. This is not a documentary, this is an anthology film based on black comedy and taking place millions of years ago. To be honest with you,it is a good comedy, but I cannot appreciate it because of how far it is of what it pretends to be.
Overall, it is a great time with a lot of fun moments. Yes, CGI is quite bad, but you get used to it pretty fast and the characters have much more development that in a lot of movies even though they cannot talk and the narration is almost nonexistent. Unfortunately, the movie, as a whole, is brought down by its lack of honesty with the audience.