My favorites from my collection (rating, out of 5):
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Blue Planet; parts 1 through 4 (6, really)
Hitler's Lost Sub (5)
Coral Reef Adventure (4.5, Not for neocons. I love the CSN soundtrack.)
Island of the Sharks (4.5, a better title would have been "Cocos Island")
Underwater Trilogy (4, great value -- close to 3 hours in length)
Diving DVD Florida Keys (3.75; average of a 3 for production values, and a solid 4.5 when I can't get to the Keys myself)
Into the Deep (3.5, would have been better if it didn't move so slowly)
Galapagos (3.5, a better title would have been "Under the Waters of Galapagos")
Coral Sea Dreaming (3, moves very slowly but stunning video quality)
The Abyss (2.5, schmaltzy ending to what was going to be a great movie)
Open Water (2.5, but a 5 on the "Indie" scale)
From my almost-7-year-old son's collection:
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Dolphins (5)
Finding Nemo (4.5)
Captain Jon's Island Adventure (4.5)
Captain Jon's Shark Safari (4)
Captain Jon Explores the Ocean (4)