I've read the other reviews on IMDb, and I think most people stopped watching after the 1st or 2nd episode. I agree that those episodes were not good, but I'm glad I pushed through.
In all episodes, the camera quality is phenomenal. Some reviewers didn't like Tom Hardy's narration, but I don't feel that way. I think his voice was perfectly appropriate, never monotonous or overly enthusiastic. My biggest problem is the pacing. I think each episode could have been trimmed by 10-15 minutes.
The first 2 episodes, Cheetah & Lion, cover animals that are so commonly covered in documentaries that they present no new information at all. To make it worse, for those 2 episodes, the camera crews weren't lucky enough to capture any particularly epic hunts, so these episodes drag on and probably aren't worth watching.
Episodes 4-5 are much better, though they are still slow-paced. Episode 3, Puma, has no new information, but the guanaco hunt at the climax is jaw-dropping. Episode 4, Polar Bear, covers bears hunting beluga whales, which I have never seen before. Episode 5 covers the rarely covered African Wild Dog.
In the end, I wish I had skipped or skimmed through the first 2 episodes, but the last 3 were well worth the watch.