How on earth can Carnosaur only have such a low rating? Did that many people really sit down to watch it expecting something good to come out of it?

The title alone tells you all you need to know "Carnosaur" yes, it is going to have horrible special effects, yes, the plot is going to be worse than the special effects, yes, the acting is going to be worse than the plot. Yes!

Not even a child is going to sit down and think "well that was well made."

But the point of these movies isn't really to be entertained from watching the movie. The point of a movie like this is to be entertained from roasting the movie with your friends.

I guess, at least, it made the factual link between a T-Rex and a Chicken, and probably did so without consulting an actual scientist... but, well, other than that it's crap campy, roast worthy fun.