First things first - this was, for any adventure movie lover, a good adventure movie. It had fights, trains, vertiginous heights, lost tribes, cool shots of 1800s steamers, close encounters with wild beasts, a damsel in distress, the obligatory bad guy. For any firearm aficionado you can feast your eyes on m1889 Schmidt-Rubins, Maxim machine guns, Walker Colts, Turk Mausers, etc. There's lots of high action, killer scenes of Tarzan swinging through the jungle that are easily the best done scenes of any Tarzan movie extant.
For most Tarzan fans who have never really read a Tarzan story - it's a good Tarzan movie with most all the crucial elements you've come to expect except with the bonus of being minus the 'dumb Tarzan' thing that I never understood (although there is a reference made to that). Inaccurately, he is depicted as being able to speak to all the animals, they're all his friends, etc. Exactly as any fan of the movie Tarzan might expect. Except it never happened in the books.
For the Tarzan fans who have actually read some or all of the original novels there were a couple things I would have changed. Chiefly, Tarzan got his arse handed to him on too many occasions. I know it builds tension when the good guy gets knocked down a few times but finally stands victorious on the field of battle in the end, and that's fine. I don't wish to add any spoilers so I won't give any specific examples, but there were at least a couple of those fight scenes that, having read and reread the source material (or what I assume would be the source material - considering that this is Hollywood we're talking about that source material might be anything including their own highly inaccurate movies of the past) that Tarzan should have come out more victorious. This is, after all, the guy that vanquished the savage Kerchak as a teenager - the former king of Tarzan's ape tribe - with his bare hands and his father's hunting knife. I've never read a Tarzan story where he got his butt whooped so many times.
The Edgar Rice Burroughs fans, and I'm one of 'em, always tend to be highly critical of every detail that doesn't match up 1:1 to the original novels. But this is true of any fan of any written work that makes it into film. We always want to see those things we've imagined from the written descriptions leap to vivid life on the big screen But when they don't, or when Hollywood perverts them, well - we all know the saying: the book was better than the movie. I wonder when Hollywood will hear that phrase and take it to heart? I'm not willing to offer any spoilers for those who haven't seen the film, but there are definitely elements that were changed or left out that would certainly affect any possible sequels based on our favorite novels (Tarzan and the Jewels of Opar for one, and I would dearly love to see La brought to life as Disney did with Dejah Thoris, where Lynn Collins created a mesmerizing vision of ERB's Princess of Helium). To the true fan you will instantly miss the antagonistic relationship in this movie that Tarzan always had with the cat family, and you will note the absence of all the familiar ape words: Numa, Sabor, Tantor, Gimla, Paco, etc - all conspicuously missing. And while Tarzan only ever befriended the one lion, Jad Bal Ja, that I'm aware of, you might scoff when he stumbles unaware upon a group of lions feasting on a kill (that he never smelled beforehand by the way since all his heightened senses of hearing and smell and eye sight are also conspicuously missing) and instantly begins communing with one of them. If anyone is really interested in seeing a scene that perfectly depicts Tarzan's true relationship with Numa the Lion in gripping accuracy google Boris Valejo's cover for Tarzan the Magnificent - that piece of art is a perfect rendition of how Tarzan reacted to Numa.