Yawn.

Rating: 4/10 (8 December 2017)

Another disappointment. This mishmash of a movie doesn't seem to know what it wants. It pretends to be an adventure movie, but more than half of it is spent in England's high society. It pretends to be a thriller, but not for a moment was it riveting or scary. It also wants to be a drama, but not for a second did I care even one iota for one of the characters.
The plot is clearly made-up and juiced up for Hollywood. I.e. the hero and his two buddies who have been on his two prior expeditions, are conveniently and magically reunited in the same World War 1 trench (sure, sure, it say they were both transferred to him, but in reality you know the army brass wouldn't give a hoot).
The jungle scenes are brief and short and you never really get the idea that they're really out there roughing it. Sure, the movie tries, but it fails. The piranhas and Indian arrows and whatever else seem more of an afterthought that the director threw in there to mark the boxes on his "checklist of excitement" and it just doesn't work.
The hero sure is a moron too, by the way. His "expeditions" consist of a handful of men, a rickety raft, and they are always short on supplies. He's just asking to fail. Couple this with his ridiculously naive worldview where Indians who wear loincloths and live in mud huts somehow aren't savages, but his "equal," and he deserves what's coming to him. One of his quotes is, "oh look, these people managed to build a field of maize, with mathematical precision" and he practically gushes about how smart and civilized and wonderful they are.... OK, buddy...
The movie ends without really knowing what happened to the hero and his kid, but given that they were stupid enough to go into the jungle all by themselves without supplies or support, I'm sure he got what was coming to him.
Not gripping, not exciting, just yawn and stupid.