Agreed, if we compare another coaster from Gerstlauer, in the same country, owned by the same company... Saw the Ride in Thorpe. As far as I know it's been pretty problem free and hopefully it will stay that way. I think also The Big One in Blackpool has had two station break failures in the past causing serious injury but it's still running.
Being an engineer myself (although not of coasters) I've seen that some times designs just don't work and are plagued with issues. Take cars for example, the same manufacturer can be know for making super reliable cars yet now and again may sell a car which has got awful reliability. The same also goes for maintenance, you can have the parts for the most reliable car in the world but if you don't put it together property or maintain it well then it still will have issues.
However I'm not making any assumptions, what caused this could have been a variety of reasons. Poor design, human error, poor maintenance, poor assembly... who knows until the investigation is complete.