I did the same in FO3. Decent but not outstanding games on their own but really great once the modders get going. I really like loot-driven games with more realistic gun physics (more damage taken/given, high accuracy, etc). The base FO4's weapon/armor mod system is doing much better for me than FO3 did but I still am pining for variety. I've been meaning to restart FO4 with some mods.

The performance issues were really terrible at launch. It's somewhat better now but it really prefers current-gen hardware and running from an SSD. It's really sensitive to memory bandwidth too.

The thing that killed my interest in FO4 is the lackluster story. I don't mind the whole setup but it felt they never built up the story enough to make it comparison to New Vegas' endings which I felt were more interesting. It always seems Bethesda fumbles with lore in their games more than anything.