Not sure about hate, but i think it seems like some people trying to paint a grime picture of the impact and made it seems like it's a very unreliable and simply unusable for hunting.
This dude (from Australia i think) seems to be able to use his M3 very effectively for hunting all day and all night long:
No, i had to dial down the micro wheel a few clicks to drop it down. Today i dialed it down even further! closer to 900, the beginning when the bottle is full at 250 bar is giving me the same velocity as when i ran it down to 70 bar, close to 900fps for the CPHP.
I'm also playing with the NSA slugs as we speak, switching the transfer port on the barrel from P to S for slugs, the versatility of these Impact never seize to amaze me, can easily go from 14gr pellet shooting even at super low power (i was playing with 750fps at 18ft-lb earlier) or crank up the reg to 120~130 bar, tweak both Macro/Micro wheel and the valve to shoot 23gr NSA slugs at 1000+ fps with 51ft-lb of energy, the transition in power can be done rather quickly within minutes, with the standard STX barrel, no power slug kit, or heavy slug liner and tungsten hammer necessary, but i probably should do some research on those upgrade for slugs above 33gr.