Not really, but sometimes yes.
There's two types in there, the old raid weapons which can be decent but nothing special and WILL be replaced later, and the original Ori weapons. The latter are kinda weak for SSR weapons (due to their bad base stats), but if it is Assault and you need one Hammer/Lance/Glaive/Bow for a Phantom Grid, well, those weapons are way better than SRs.
They're mostly there as temporary placeholders for newer players until they find FLB weapons, as a catch up mechanic. Really badly made catch up mechanic, but it's there, I GUESS.