Nalak and all celestials are not difficult, at all. There will have been dozens maybe hundreds of people who have soloed these and many more capable. Some of those will be hunters.
This goes for all the other non-derp hunters about, too.The only thing holding me back from doing more celestials, are random people joining in on the fight
Galleon/Ordos would be fairly impressive as I've never heard of hunters soloing either (or anyone soloing ordos), sha of anger I can already imagine a few ways hunters can do it easily so no props there.
Most importantly as others have mentioned their hp got cut 75% off, and their abilities weakened now. People solo'd these as tanks fairly easily BEFORE the nerf.