I have a question for anyone who reads this. Does the existence of New Vegas make you enjoy Fallout 3 more or hate it more? Because for me it makes me like it more. It's like the Alpha/Beta version of New Vegas in a different environment with worse writing and it's filled with good and bad moments. By the way, just to make it clear, I played New Vegas before I played FO3, so I don't have any "nostalgia" bias for FO3 or anything like that.
My opinion of F3 changes, but it's not down to New Vegas.
I used to really like F3 back in the day, it's what introduced me to the Fallout Universe. But as time goes on, the game shows its age. And there's nothing in the Game that could really keep it fresh. You're always going to do the same quests with the same outcome regardless.
New Vegas on the other hand was what made me love the Fallout Universe.
It's aged a lot better because I feel I can go back to it and find something new that I hadn't done before. Even now I'm debating whether I should return to it soon despite me completing it again just a couple of months ago.
One games gets worse while the other improves.
I do however, dislike Fallout 4 more because of New Vegas, for me, a sequel is meant to improve on its predecessor, and F4 just feels like a massive step back from New Vegas.
If we never got NV, I may have enjoyed F4 a little bit more, but when you go from having dozens of ending to about 4, there's a problem.
(Note. I've seriously read people say that Fallout 4 had loads of different endings, which is just too funny).