Recs.
Updated
The Elder Scrolls III: Morrowind is an open world high fantasy game.
Specs
Pros
Pro Living breathing world
The political and social conflicts between factions and various groups are numerous, and affect your gameplay. Some factions' quests directly conflict with each other. The sheer depth of political and social conflicts in this game mean that no two playthroughs look the same.
Pro Gain levels from play
Leveling one's character works through what actions one performs. If a fighter and one fights a lot, they will gain experience in fighting, if a mage and one uses magic a lot, one gains experience in magic.
Morrowind is one of the first RPGs to level in this way and is now a staple of the franchise.
Cons
Con Shallow hack and slash combat
Combat is a bit basic with no information on enemy health and not much in a way of enemy AI. Bad guys will just go straight for the player and all one can do is hack and slash until all are dead. Over time this become quite boring and annoying as there is really no depth.