Really? I don't remember it being rough whatsoever when I visited in May as for Stampeda I don't ride the wooden coasters with bad reputations as I'd rather just enjoy my day than queue for something that I'll come off complaining about.
It's probably worth pointing out that, to the best of my knowledge, I believe Joris had some retrack work done shortly after I last rode it. It's probably much smoother now. I found it a little dull to be honest, but I thought Stampeda had a good layout so I enjoyed it. I may have been lucky, but I don't see what all the fuss is about Stampeda and roughness. Not smooth, but just rides like a lively woodie I felt. No worse than Megaohobia before it had work done on it in my opinion.
I think for me it's about restraints and layout. I enjoy Saw, even though it gives me a headache, but the small restraints don't line up with my ears so no bashing. Same with Smiler too, and both have seats that are comfortable to sit on. I've never not enjoyed a woodie no matter how rough, and I'll do any I'm presented with, because I have freedom to move with just a lap bar. Some of the joltier parts of Big One I can forgive for this reason also.
But the likes of Dragon Kahn has big thick B&M over the shoulders, so there's no escape from the jolts and head smashing. Colossus isn't necessarily too rough per se, but the restraints and seats I find are so restricting and uncomfortable, I just can't tolerate it and I absolutely despise it.
I'm not bothered about rattles, vibrations, and even some jolts as long as I'm having fun, the seat is comfortable, and I'm not smashing any of my body parts against something hard. I don't expect a contraption that's designed to exert forces on the human body to be completely smooth. Now I'm middle aged and starting to feel it a bit when riding coasters, if I got too hung up on smootheness, there'd be hardly any coasters left I would be able to ride, and I'd give anything a go once. Blue Fire is smooth as silk, but that could be why I fund it so boring.