What would seem like just another hokey B-movie is actually a pretty effective survival thriller. The familiar story is rounded out with above-average production values, strong performances, and genuine suspense - although it does stretch credibility toward the end. Despite it's flaws, it is far superior to most other "giant killer predator" movies.
Despite a tone-changing, generic ending in the crocodile's lair, the first 1 1/4 hours is a tension filled time with great suspense augmented with above-average characterization of its bigger-than-usual cast. McLean is a breathtaking visual director and respects his B-movie formula greatly more-often-than not. However, like most nature-amok films, it can't always balance maturity and cheesiness well.
Solid and enjoyable enough monster movie in which Radha Mitchell once again shows how good she is pretty much every time she's on screen. Mia Wasikowska is in this but I think it's fair to say she's come a VERY long way.