I watched this show as a child and it was very formative for me. It's very well-made and fascinating.
Dr. Joy Reidenberg is my favorite member of the cast - she is a joy indeed, and her excitement is contagious. Her genuine love for and interest in biology shines through every second she's on screen, especially when it comes to her specialties in aquatic animals and vocal anatomy. She explains things clearly in a way that makes her deep understanding and expertise obvious. It would NOT be the same without her.
I really love seeing these huge creatures be cut up and explained. It's a lot more hands-on than other edutainment media and goes more in-depth in some interesting ways. The whale episodes are my personal favorites. I highly recommend this show to EVERYONE - even if you don't think you're interested in biology, this show might surprise you.