I've had problems with every make of bike, some were so badly made that I would never buy them again and others have never let me down.. I think the real question should be which bike can you keep on the road with the least amount of work..
Just take a look at the technical threads on this forum to find hundreds of shadows that need work to either get running or to keep running..
All the dedicated bike forums are the same, some offer help more freely than others but they all have problems..
Reliability often depends on how you use your bike and how well you maintain it..I don't have many years left so I probably ride further and sometimes faster than many other riders so my bikes have to put up with a lot more riding than cleaning.
Some Harley Davidsons are still running after many more years on the road than some Japanese bikes but this is mainly down to the care their owners give them, Royal Enfield bikes made in India seem to wear out faster than they should and Chinese bikes just seem to fall to pieces if you try to use them much more than 20,000 miles a year.
John.