To clarify, Hades 360; the inversion was the only smooth part. The ride was absolutely horrifying in 2012, my coaster count is at 615 according to coaster counter, and Hades 360 was by far the roughest coaster I have ever been on by a country mile. I'm not exactly soft either, so I can't say I was being overly sensitive about it. The shame is when I first rode it back in 2007, it was absolutely brilliant, back row at night was mind-blowing.
The other coasters at Mt Olympus weren't super rough last time I was there, nothing exceptional as coasters, except the last drop on Cyclops. I actually like Mt Olympus personally, there's cool go-kart tracks, and lots of them, the ten foot wave pool, indoor and outdoor water parks. It was fun, though it is out of the way.
Avalanche was a bit rough, much better front row. It's a funny little park, Timber Falls.