As you might be able to tell from my nickname, I am a snake NUT. So, viewing this movie was essential for me, no matter what the quality of the film was SUPPOSED to be. Going in with my eyes wide open, I was aware immediately of two things: 1. The movie is VERY low budget, and 2. The effects were, for the most part, very realistic.
While I can't say that the movie fails to entertain, it does have problems. The acting is average at best, the plot is predictable, and the style of filming is very much like a made-for-TV movie. Think of a Stephen King ABC Mini-Series, and that sums up the film's style.
That said, what the movie does right also impressive. There is no computer animation, and at no point do any of the slithering baddies of the film do anything "supernatural". The reptile action is very plausible, a refreshing change from other recent pictures like "Anaconda" and "Python". What the film also does right is not take itself too seriously. There is not a lot of over-acting, and no character in the film seems beyond belief. One thing I also appreciated was the fact that the snakes are treated as a menace, but not as villains.
Where "Venomous" fails most notably is its lack of ability to build suspense. There is one particular scene that stands out among the rest, but aside from that golden moment, little else is particularly chilling.
I have read reviews of this film that call it a copy of "Outbreak". While there are several similar elements, "Venomous" does stand well on its own. The running time is nearly an hour shorter between these two movies, and "Venomous" does a good job of character development. It also focuses more on the carriers of the virus than the virus itself.
"Venomous" also relies on stock footage more than once, perhaps to keep the overall budget down. I will be general here not to spoil any of the film's moments: There is one crash scene where the vehicle crashing is TOTALLY different from the one in the previous shot. Watch for it with your remote in hand, it is amusing that the film makers thought no one would notice.
My overall opinion? Rent before you buy, and only buy if you really like snakes.