While Colossus Slayer does not stack whith Hunter's Mark nor is applied to off-hand attacks there is nothing OP about it. Actually I've written simple Monte carlo fight simulator in Python and the most damaging class are now Strength Thief with Handaxes, next is same build but Beastmaster with Giant Spider and finally until he has a spell slots, Wizard with The Sapphire Spark casting Magic Missiles. Hunter are far far away in terms of pure and sustainable damage per round.
That's testing sustainable damage. With a Hunter because you one shot from stealth and range you don't actually get in combat. So sure other classes might be more powerful in combat, but being able to one shot most trash enemies and avoid combat is quite good. One hunter can solo the entire goblin camp from range without taking a single hit and doesn't have to poison them first. It's certainly not bad.
Again, so what? Its trash mobs, you are sniping from the shadows..............Where is your problem here? Again its low HP enemies and its from the shadows. Guess you havent read about sharpshooter. When they implement you being able to hit from 600 feet, I dont know how much your head will explode. It plays into Rogue as well. He hides in the shadows, kills bad guy, hides in the shadows undetected..........This entire argument is just dumb. "Hey guys its a bug that stealth works as intended." Again get over yourself. I look forward to CS and HM working at the same time, so I can snipe trash mobs from the shadows. Lol youre ridiculous. qq "guys my hiding and sniping worked too well" qq. They havent figured out how apply CS on its own yet, so really your argument is the (at most) +4 modifier being added, which balances HM not being applied. Why its like the developers learned something was an issue and made a work around why they figure it out. Good thing youre here to make sure no one does extra damage.