The newest AC3 glitch I've encountered consists of climbing a building in the New York ruins area, where I am then launched into the air and then fall to my death. Happened twice. At least it's funny.
Pretty sure I've had a Skyward Assassin glitch myself at some point. Or maybe that was Revelations, can't remember... though I definitely recall clip-through-the-ground-and-fall-infinitely glitches multiple times in AC:III. One of which happened as Desmond. Most unexpected.
My Oblivion character's having trouble with Kvatch and ran out of health pots because of all the flame atronarchs, so it's time to find some sidequests. Bruma and its shops are close by right now, so I'm off to investigate that shady vampire hunter quest.
As explained above, while Skyrim has similar quests... they're dull in comparison. And not free. It's strange. I didn't even like Oblivion until I spent more time with Skyrim. This is in large part due to mods, so I'll give it another chance once Skywind makes progress.