A. Depends on what you do with them.
B. Not every class responds as well to having the best 10 items in the game hung off of them; some will be better than others in that very specific use case. You only play in that very specific use case.
For those who have to do more with less, ocean actually responds quite well.
I do understand the frustration you had when you thought you'd discovered the new hotness with your ocean tank theory, though. You were excited about the idea for about 10 minutes. :)