Sometimes it's accurate.
How 'bout that Terra Nova show? Also could be called "Avatar 66MYA" because it's the same guy playing the general. I've only seen two dinosaurs in the trailers: Brachiosaurus and Carnotaurus. Now, the latter is my FAVORITE dinosaur of all time. However, I'm disappointed that they're just pulling dinosaurs from every continent and era. If you're going to land in a specific time, you're going to deal with a very specific faunal makeup, sorry.
The Late Jurassic Morrison formation (where Brachiosaurus lives) would've been great. Where Carnotaurus is from? Not so much. There aren't as many dinosaurs there.
And as my friend Matt Wedel said on his blog, he bets money that there will be "others" encroching on the human settlement, some unknown dino-like humanoid creature, or maybe Sleestacks. The thing that REALLY makes me cringe is that they're actually going to make some of their dinosaurs up: some kind of super-raptor called an "Acceleraptor." God, just use Deinonychus!