Space Mountain is rough, but it's no Baco... At least Space Mountain can potentially be fixed by getting the new Vekoma trains, is relatively well-themed (it WAS so much better before the Mission 2 crap), and isn't constant pain-inducing...
Baco is THE worst ride I've been on, Bakken's Tornado a close second... In truth, they are equally as bad as each other, but one has to win (or lose depending on how you would receive the worst ride award)...
I rode both twice (not a few times, myself and Mark refused to even with no queues), Baco to get an inside seat after the initial outside seat ride (and use our front row Fastrack thing, upon which it promptly broke down), but for both to see if they were as bad as the initial ride made out... Multiple rides are sometimes needed to double check opinions, and I do so when I can (didn't for Sequioa Adventure and Mean Streak because queues would have been involved, and I have better things to do than queue for god-awful rides)...
My next visit to PA will involve me staying as close to the B&Ms as possible, and only going near Baco to walk past it...
Tornado would be a good ride if it didn't launch I reckon, but Intamin thought otherwise... Both rides are evident of Intamin's poor design process in recent years (see also, retracking a year old ride), which is why we'll never see another version of either built again (Skyrush being an evolution of Baco because it's THAT bad)... And clearly the majority agree it's rubbish, otherwise why else is it the only one in the world?