I found two major bugs that really hindered the experience for me. First, One of the members of the Companions is glitched he chases after me trying to tell me to join, when he is chasing me i am unable to fast travel away from him and when i'm talking to anyone else in game he interrupts and makes it almost impossible to receive a quest when he's around. I also walked from Whiterun to Labyrinthian he followed me only this time he helped fight the trolls before he talked to me...Second the skeleton holding the first dragonstone fell through the map and i was unable to get the stone; regretfully i put another five hours in before i realized it was part of the main quest