Forks are a matter of degree and what you're used to. No reason to expect a $150. fork to preform like a $1,000. downhill setup. If your used to no suspension a sprung fork of any type feels pretty good. I build vintage style bikes with1900 era forks girder, dual spring, single spring, leaf etc. with no rebound control so I don't expect much in the way of suspension & and there isn't, compared to a decent MB fork with hydraulic or air rebound control and a world of difference from the really good stuff with 5" of travel or more.
It's hard to prove something in a court of law let alone in print so enjoy what you've got and upgrade if you want proof, but it really costs to do so. I like round steak and love ribeye and because I've tried both I have proof of which I prefer, but I still eat and enjoy round steak more often because it's quite affordable and tastes good, just not as good.
A bucking fork by definition, is one that doesn't have adequate rebound control or no rebound control. The spring compresses to absorb the initial shock, but slams back to it's stationary position too quickly without adequate resistance from some type of shock absorber most frequently hydraulic or air types on better forks. Thus a fork alternately compresses and slams resulting in that "bucking" feel. I know this feel well because all my classic fork equipped bikes demonstrate some degree of this characteristic and that's what I use on all my bikes builds, but on my mountain e-bike I have really good full suspension forks and shocks that ride like a dream compared to any of my classic forks on hardtail frames.
Rick C.