It doesn't really matter which Fallout games you enjoy, as long as you don't make bait posts to try and incite arguments about it. We have a few members who enjoy Fallout 3 or 4 for what they are.
It's cool, nobody gets lynched for liking 3 and 4. You might face a lot of questioning and criticism if you mention something you like that nobody else likes (see: CT Phipps and every single of his opinions about Fallout 4).