The game is so littered with game-breaking bugs it had to have been kicked out the door with little or no testing. Even with the two post-release patches there are countless times you'll find yourself unable to go on due to broken quest triggers. The series prides itself on its "open world" construction and it's true, you can run all over the land without experiencing a loading screen, but even if the world is open, the quest progression remains in large part linear. If you happen upon a quest NPC before you're meant to, you just may break the quest and have to revert to a previous save or even start the game all over. Another fun little quest breaker is something I like to call "NPCs Behaving Badly." Quest-essential NPCs disappear in front of your eyes, refuse to speak to you, and, once in a while, walk behind impassible geometry never to return.​