Some did look better in-game than on the gifs I saw.
GNB and DRK for example don't look as bad imo ( I still think they look underwhelming as Relic weapons tho ) and the DNC I actually thought looked good.

The SAM tho I just... Wtf xD?`
I got it and equipped it and it felt like a normal weapon someone painted orange but then some spots didn't get the color and remained black.
With that said tho I still like the previous step so I am still using it for my mog.
But the final one doesn't look like a Relic weapon imho it actually looked worse than I expected based on the gif.