I didn't rage quit but i did cry and i was upset for some time. Later in SoR i think it was, i cried some more. Won't go into details. But yes good story
Not much difference, you can LOSE companions compleely by doing evil choices though, aside from that, most of cut scenes are pretty much same no matter what you choose, which sucks.
This sounds like an issue with the game itself, meaning either a repair or a full reinstall might be needed. Have you made sure you also have best graphics drivers for your card as well?
Good luck
When you uninstall make sure you get rid of everything, if it still fails try running a repair, sometimes when i reinstall it hits points where it won't patch and i need to run a repair then it continues okay after. Good luck.
You should be able to re-attain the quest. Sometimes logging out or leaving planet and coming back helps. There is some quests you cannot re-attain though. I would try leaving area and come back see if it resets the zone.