Comments like this are not helpful - and generalisation is dangerous. We have 3 Jab's - 160, 2 x 230s, with a combined 1,400 hours in the past year. We have done little work on them other than routine (but correct and full) servicing. Our sister school at Orange has done over 4,000 hours in 3 160s over several years and has had the same experience as us.
And, yes, I do know there are also plenty of examples of issues out there, but the number of Jabs in service is very large - much larger than any other Rec aircraft - which in turn means more reports of problems in absolute terms.