Most creature features recently had the same problem: extensively showing creatures that look computer generated from a mile. In that respect, 'Blood Monkey' is much better, because it doesn't show the monkeys through 95 pct of the running time. Suspense is created successfully, because the characters only know something is lurking in the jungle, but they have no idea how dangerous it actually is. This is closer to the 1940s horror movie style than the current gore-in-your-face flicks which leave nothing to imagination. I also liked the location in Thailand, it provides a convincing background.
On the other hand, the movie has serious flaws. To name a few: the video camera thing, one actor filming the others, which has been done to death in the past decade. Story logic - for example, why do they go hunting with only one huntress and one gun, I'd have armed myself to the teeth if I were in the professor's place? Briefly, there is some irrational behaviour to the point it's sometimes annoying, such as the students buying cheap excuses, and some of the young actors appear to be quite amateurish, anyway, but I realise it is a tough job for them to play next to an F M Abraham.
To sum it up, the movie was not extraordinary, but at least better than I expected from the other reviews around here, and more interesting than various recently released shark, crocodile or piranha flicks. I voted 5/10.