Not just Osteo Striga. Most primary exotic weapons are toooooooooooooooooooo weak in PvE. I think every primary exotic weapon deserve a buff of intrinsic anti-champion mod. Some raid primary exotics even should be able to against more than one kind (They are much harder to collect, they ought to be more powerful than other exotics). Bungie should give us a strong reason to use primary exotics in PvE activities, not just let them be white elephants.