5. Bug Test It!
One of the biggest complaints about these games, especially New Vegas, is that it seems they are not really bug-tested at all. Granted, these games are packed with such a wealth of data that extensively testing every facet would prove almost impossible, but seriously, there's a glitch in New Vegas (the head-spinning episode above) within five minutes of starting the game, and all it says it that the developer hasn't paid due diligence. While these bugs are mostly fixed by updates, I don't really consider that good enough; I want a refined, polished product released on day one, not some glitchy mess that deletes my saves until Bethesda patch it a week later, essentially rendering the game pretty useless during that time.