I feel like all weapons look the same including legendary weapons. It's like there is no truly "unique" weapons and it's all just borderlands style guns.
you know i don't necessarily mind this
as fun as they are to find and as overpowered they usually are unique weapons are weird and sort of nonsensical from an role playing standpoint because they don't really play well with the rules of the setting; they're usually mysterious custom-created weapons that are extremely powerful but also one-of-a-kind with no explanation as to why they're so useful and especially why they have weird effects, and what's more is a character
using a unique weapon sort of loses their identity; they're not winning combat due to superior firepower, they're winning combat due to
one specific weapon which sort of feels like they're being aided by an entirely new character, or the new weapon has become a facet of their characterization
like if i were to play through new vegas and mostly use the ratslayer the ratslayer would be incorrigibly bound to the way my character operates because this name, specific weapon helped propel the story
fallout 4 does away with that problem by abstracting 'uniques' into just a strange function added to an otherwise-normal weapon, helping make them more mundane
(fallout 3 could possibly be viewed as doing something similar, but what's more likely is that fo3's uniques were poorly concieved and boring and usually just flat damage increases or something and should be ignored)