I pointed this out a long while before release, about how I had this funny feeling about the under water exploration and how it just didn't fit with GTA. I felt like it was wasted resources. The underwater portion of the map is VAST and I felt it was wasted energy as that could have been used for more interiors or even San Fierro/Las Venturas. Of course I was flamed by the Rockstar Games defense force for complaining about something that I haven't played yet.
Well, I beat the game and my opinion stands, outside of the missions, I just do not have the desire or urge to go into the ocean. Explore? Maybe, but I don't play GTA to be a National Geographic explorer, I play to be a virtual criminal and immerse myself into the given city. I felt like GTA 5 was lacking in interiors because Rockstar used that space/memory for the ocean.
Now that many of you have played GTA 5 and beaten it, do you still think that the ocean was a better choice than having more interiors or even San Fierro/Las Venturas?