YMMV / Valley of the T-Rex

• Audience-Alienating Premise: Most viewers aren't going to like a documentary about the most famous dinosaur among laypeople not being as mighty as it's commonly thought, and the blatant, one-sided presentation with lots of errors is not going to appeal to science and Dinosaur lovers, who will notice and pick apart the problems more easily.
• Hilarious in Hindsight: The idea of a chubby T. rex was seen as laughable by many and was often used as a punchline when discussing this special. Over twenty years later and another science documentary on dinosaurs would revisit that same idea but present the animal as both a scavenger and a hunter, which by then was a firmly cemented fact.
• Older Than They Think: A lot of the common criticisms against Horner's scavenger theory were already voiced long before this documentary even came out by some of his colleagues. Gregory S. Paul was very critical of this idea in his 1988 book Predatory Dinosaurs Of The World, where he expresses frustration over the then-growing notion that large theropods were lumbering scavengers incapable of hunting, and explains in detail how these animals were built to be skillful predators and how unfeasible a scavenging lifestyle would be for anything other than a soaring bird, especially a multi-ton tyrannosaur.
• Vanity Project: This is very much one for Jack Horner, given that he's the only paleontologist featured in this documentary and its sole purpose is to promote Horner's own (largely ill-informed) pet theories about T. rex.