Skip this and watch The Jungle Book instead...
By coincidence, two movies came out this year that featured characters raised by animals in the jungle. The Jungle Book got it right... This one, not so much.
What was wrong with this movie? Well...
• CGI (sexless!) gorillas, elephants, etc. (To be fair I have yet to see a movie with convincing CGI animals.)
• CGI landscapes and oceans, complete with mismatched lighting sources. (See The Finest Hour for another awful example of this...)
• CGI gnus and ostriches. Not once did Samual Jackson look like he was sharing the same space as them. (See Peter Jackson's King Kong for a similar failure...)
• Gorillas swinging through trees. They don't. Even grade school kids know this.
• Gorillas all looked the same so I couldn't tell the gorilla characters apart. Except for...
• Cliché angry/evil one/scarred-eyed animal (gorilla). See Koba (Planet of the Apes), Shere Khan (The Jungle Book), 2005 King Kong, Scar (The Lion King), etc
• Spiderman vine-swinging.
• Dubious physics. The train scene with the impossibly long vines that paralleled the train was downright funny but I don't think it was intentional. Vines behave as ARCS so they should have landed on the train immediately, or plowed into the ground beside it.
• Samual Jackson talking in modern day tones and language. That 'licking his nuts' buddy joke they shared was completely out of time. Kept waiting for him to reference 'these m*f*k*g ostriches/gorillas/whatever'.
• Tarzan. Moody, totally lacking in charisma. Nice eight-pack though.
• Clubbing viewers over the head with the 'evil/exploitive white man' trope... the tusk scene, the dead flamingos scene, the massacres of natives and gorillas...
• Making Christophe Waltz uninteresting -- well except for the rosary/garrote bit which seemed more like something from a James Bond movie
• Goofy plot points such as the 'crododile mating call'... with a garrote around his neck(!)
Probably more to list but I've got my day ahead of me.