5th SEASON. not year. that ride hasn't done 5 years service like a gold coast ride has. Hell - Superman has been going for 13 years and you wouldn't catch most people calling it rough...
As far as I'm concerned, for a park that shuts down for such a big chunk of the year, maintenance ought to be top notch, as there's plenty of time to deal with refurb and upkeep.
Eh, being the only good coaster in the most isolated city in the world makes me think the "smoothness" of that ride is probably over-analysed and over scrutinised. It's a Gerstlauer Eurofighter, not a B&M hypercoaster - it is what it is. It has abnormally tight, crazy elements and transitions in disgustingly hot weather that's so hot that for most of the year it would come close to the edge of Gerstlauer's operating temp limits.
With that in mind, it runs pretty damn well in my mind, but then again, I wasn't overly sensitive or fussed about DC Rival's "vibrationgate" either.