I mean I have Beast as my #1 wooden coaster so I have a pretty high tolerance toward rough coasters.
I tend to have a problem with roughness when it's the only thing I walk away remembering. The neat part about Beast is that the roughness is an afterthought; yes, you notice it's there but it doesn't take away from the ride. In fact, I genuinely believe it adds to it and would suck without it. For steel coasters, I don't mind some roughness as long as I'm not getting jarred a whole lot.
There are two rides that I absolutely despise because of the roughness alone: Kong at SFDK and Gold Striker at CGA.
- Kong felt like I was in a car accident and being possessed simultaneously. It jarred me around in ways I never knew were possible. It's easily my least favorite coaster I've ever ridden.
- Gold Striker was way too rough for being a relatively new coaster and a GCI. I was genuinely shocked that a GCI could be so rough, and the more I rode it, the less I tolerated the roughness.
Also want to note that restraints absolutely make or break a ride. The RMC shin restraints or whatever they are are horrendous and have caused me to be intolerant of thigh/shin pain, especially when marathoning. Storm Chaser is a notorious example of this; I can't ride more than a few times without it getting to be too much. The KumbaK restraints found on SLCs also suck. I wish T3 had the original restraints that didn't press on your thighs. I'm also not a fan of Banshee's restraints; 2018 sucked in that regard because it definitely beat the hell out of me when I marathoned it.