Sacred Haven of Debauchery

You can complete the game with all factions, and most hardcore players do just that. Moreover, completing all quests is linear. Not very convincing.

Let's say you're role-playing, as I already mentioned, but the role is predetermined. However, you can still feel like a thief, for example. And "min-maxers" are indeed a well-known problem. But role-players create new heroes for each faction playthrough. And one faction can block another (Great Houses).