I flew them for 6 years.
First and foremost, they do need a bit of scheduled TLC. APU life is ok, but the generator brushes are crap frankly and need change schedules of 1,500hrs or so to keep them reliable. To be honest it was piss poor design not to give the APU a flight capable starter generator identical to the main engines. At least you'd have been carrying a spare along for the ride....
Secondly, prop balance is king. It's piss easy but requires line guys who care and have a laptop and small set of scales. If the props stay in balance, the NVH system can keep the cabin smooth and quiet and is also then reliable. Let the props get bad and it gets overworked and fails. Then the vibes slowly kill the rest of the airframes electronics. One follows the other like night follows day.
They can be landed smoothly. Honest. Slamming them in every time causes fatigue in the undercarriage on any aircraft, and Turboprops are all about compression damping to get the tyres to bite, so that's why they are smoother close to main gear overhaul.....
Overall, it's a very capable airframe, can be reliable if looked after and will let you down if you pay only lip service to maintenance and only fire fight.
Much like any other type.
Where dispatch reliability for any turboprop looks bad is they fly so many short sectors. My average over 6 years was about 45 mins. Rarely went tech and tried my best to fly smooth and take care of the beast.