As far as SyFy original movies go, this one isn't too bad. Sure the acting is bad, but I have seen worse, sure the cgi is bad, but again, I have seen worse. I found the two main characters entertainingly ridiculous, and the whole movie had a very lighthearted feel to it that made it better than some others that try to be too serious for what they are. This movie knows it is a SyFy original and just has fun with it. The monster was interesting rather than just being another snake or crocodile, and the characters were entertaining rather than overly dramatic. Sure, it is a SyFy original, so it isn't some great blockbuster movie, but it is better than most of its kind. If you like SyFy originals, I recommend this one, if you don't, then yes, steer clear.
And to the other reviewer's comment on David Hewlett just doing a few scenes to add his name to the movie, maybe you should look at the director listed for the movie before you comment next time.