I've tried a few and at range they just fall apart, I have the iron banner one with range finder so I'm leveling that up next too try. Honestly at most distances I would rather use a primary, shotgun or sniper.
This is pretty much why no one uses the queensbraker bow. The bow either needs an instant charge time or to spray 4-5 shots all in a tight cone at the target. why anyone would use it as is over say patience and time is beyond me. It has no advantage over it, only disadvantages. It needs to be tweaked big time. The fact it takes up an exotic slot is laughable the gun is terrible.
Fusions as they stand all need buffing. They are supposed to be the middle ground between shotguns and snipers. So they should have damage drop off further away, but a closer spread. So you cannot snipe with them as the damage is too weak at sniper range but you can still 1 hit kill at mid range if you hit them with most of the spread (much like a shotgun at close range). To counter spamming would be the long charge times meaning they wouldn't replace shotguns up close.
I believe the whole of destiny is a beta. They are testing stuff out they have got more right than wrong but still have a lot of wrongs to right.
Destiny 2 will be where it really comes into it's own they should have all guns balanced by then and know what is game breaking (final round, DOT, etc).
I don't know what they were thinking releasing the BTRD; high impact, range, stability and rate of fire with 40-50 clip size? It's pretty easy to rack up kills using one unless you run into rockets. Which seems to be the go to heavy now. No point in using machine guns if the other team is using rockets.
You get pretty much guaranteed 4+ kills with a decent proximity launcher and you aim into hot spots or choke points and then jump out the way as soon as you fire. if 4-6 people on your team get heavy that is 16-24 rockets. All of which can kill multiple people instantly if you run into groups.
This is the reason why a lot of the time I'd rather miss heavy and deny the other team's heavy using my super than pick up heavy. Heavy is far too OP in crucible you just get smashed if you don't have any.
They need a lot more game modes or custom game modes. Switch off heavy and I believe the game would be better. You already have supers so there is no point having both supers and heavy it's ridiculous.
Heavy should taken out of trials too. I'ts not competitive at all.