Jaws is the best exploration zone in the game.
It's basically what you'd expect from the other exploration zones, but there's a strong series of quests to drive you through the area; the fights are challenging, the content scales all the way up to Level 27 (the cap), it introduces Tier 4 materials and schematics, and it has some good unique loot.
It also has the things people don't like about the main game (few cutscenes, "grindy" combat, etc.), but I think it's a more effective balance (it's built better than the areas in the base game that are mostly lifeless with a bunch of MMO-style busywork).