Kingdoms of Amalur: Reckoning instantly springs to mind!
I really wanted to finish that game, but to do so meant just barrelling through the main quest, skipping all the dialogue, running past huge groups of enemies without engaging them, and ignoring damn near every side quest (of which there are maaaaaaaaaaaaaaaaaaaaaaaaaany).
I eventually finished it by way of 3 lengthy marathon sessions on consecutive nights. My overall playtime clocked in at just under 30 hours, I can't even fathom what that number would be if I hadn't taken the critical path. I would really like to revisit the game at some point, but I don't know when I'll have such a breadth of free time available as to give the game it's due.