Dragon's Dogma has the best action-based combat of any party-based RPG, and even among single-character RPGs is rivaled only by Demon's/Dark Souls. Although very much a combat-focused game, it has good exploration and decent character-related elements, as well as an entertaining narrative and even a bit of C&C.
The game is superficially Open World, and there are a few people who seem to gain enjoyment by treating it like one, but really that's deceptive since the main quests and a handful of important side quests will take you to every notable location. You should be pursuing the main quest and side quests, while for the noticeboard quests you should accept the "kill x of monster type y" ones that eventually complete themselves while avoiding the escort quests unless they have a reward you covet.
The pawn system is quite innovative, but the pawn inclinations that guide their actions is poorly explained in the game, so it's wise to
consult the wiki about this issue. Also, there's a mod that allows you to set the inclinations of procedurally-generated pawns, but you won't need this if you're playing online and using pawns created by other players. This isn't an issue for the "main pawn" that you create, since before long you'll be able to set their inclinations by purchasing potions from a merchant who appears in the Encampment once a certain point in the main quest is reached.
The Dark Arisen expansion made some improvements to the base game and added a vast dungeon with many new monsters to fight (mostly at higher levels, by which time you should have reached the final stage of the main quest).
Not only is it tremendous fun to play through the game once, but the nine vocations (i.e. character classes) are sufficiently different from each other that it will fun to play at least three times: once as a fighter-type, once as a strider-type, and once as a mage-type. I myself have played through Dragon's Dogma six times, three on PS3 and three on PC.