Ok, you have a good point there, but as soon as some good dark bits were put into the story, the impact was washed away with childish timelords riding dinosaurs and the doctors "gang" which was completely irrelevant to the story.
Some may argue that Aliens in London/WWIII was childish, but at least it didn't have much if anything irrelevant in it like dinosaurs in a spaceship. Plus the name of the episode itself is awful. Howabout "genocide of the dinosaurs", or "the dinosaur dilemma". Even "The dinosaurs in space" is a much better title. But no, they had to go for the most childish title they could find.