I am very surprised by the fact that the most accurate paleontology documentary of the 2000s was not among any of the famous dinosaur documentaries, but was actually a documentary about Mesozoic sea reptiles. Now I've seen a lot of negative comments in the reviews, but I must disagree.
First of all, while the actors' segments that play the paleontologists may seem distracting, this is actually an aspect much better than most dinosaur documentaries that just present speculation as facts (Walking with Dinosaurs and even the most recent Prehistoric Planet); now of course, that's not exactly a bad thing (since the non-avian dinosaurs were already gone now so there needs to be certain assumption to fill our gap in understanding), but when making these kinds of documentaries, I believe the producers must make clear how realistic and how much of the material presented in this documentary is real. This documentary finds a perfect solution to that by having actors playing out paleontology segments, which provides context to the speculation of certain scenes and is there to educate the audience about the ecological aspect of each animal (i.e. Xiphactinus eating Gillicus, how much of a generalist feeder a Tylosaurus was, etc.). It just shows how thoroughly researched this documentary is, and you'll be amazed by how accurately the discoveries are represented (once you search about each article regarding the discoveries showcased in this documentary).
And while some even said the music was bad, I believe that's because they've expected a grandiose score that you'd oftenly hear in BBC documentaries. Personally I don't find any problem at all and really the music when the sharks appear and whenever the Tylosaurus is present onscreen is just top notch. Animations and narration? They're pretty decent. If you think the animations are bad, that pretty much applies to every dinosaur documentary before Prehistoric Planet to be honest (yes, even Walking with Dinosaurs is very dated by todays standards). Like literally no people other than the reviewers in IMDb were this critical regarding this movie, which kind of bothers me.
Anyway, I give this movie a 10/10 for the reasons above. If you're a dinosaur/paleontology documentary fan, don't let the negative reviews miss out this masterpiece. It definitely would not disappoint you.
