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Two things at play here. A - Not much of a fan of "nature" documentaries. Tend to put me to sleep. This one held true to form. B - I am petrified of underwater life. I'm not afraid to admit it. I am afraid of birds and underwater animals. Therefore, there is no way for this movie to have been considered good by me. I was creeped out at first and then bored to sleep. It also wasn't like Earth where it followed three families of animals. It was more sporadic and just kind of random. Not a fan.
Again - I'm biased against this movie on many levels so I'm probably not the one you should be going with recommendations from.