Yes it's painful, at times it can be OK but on the whole it is painful. Though those who are like "omgzzz itz like da most fakin painful ****z eva" need to go for a ride on Great American Scream Machine.
Well, I think sometimes the people who have been on Colossus exaggerate a bit, because there are a lot rougher coasters out there, I'm sure. Considering Intamin is a good company, their worst coaster is probably as bad as Togo's best coaster.
So, my conclusion is that it's rough for Intamin standards, but not rough in terms of all coasters.
Oh, I dunno so much. I've been on ROUGHER coasters, like Pinfaris, but not more PAINFUL coasters. The crushing, the pain, the roughness, ugh it kills me. Obviously, it effects people differently due to size, the way people ride etc.
In fact, the only other coaster I came off thinking "Ow, WTF was that DELUGE of pain?" was, yep, GWAZI!
If I sit in any seat in the front two cars then I find that it isn't, but go to the back and on the cobra roll it is so **** rough and I allways have my head as far out of the restarint as possible, but even that doesnt work.
Never felt a jot of pain on it. Didn't really notice any 'rattling' either, though I suspect that was because I was too busy going 'Wheee!' The trains aren't good, but they're ok once I get in. Lack of legroom doesn't bother me much, it's a coaster, not a sofa! Maybe I'm the perfect height for it (6"2' for the record), my sister got a bit of a head bashing on it and she's shorter than me. She didn't complain about it though - then again she's not an enthusiast and didn't moan and moan cos it's not as smooth as a B&M