I have flown several times on the An-148 and also on "04", besides that have worked on them and never missed a second talking to crews about the plane. From what I know, there were some issues with the plane in the beginning, but after some tine these minor issues were resolved. Pilots in general liked the plane.
To me, it was the last real Russian/Soviet airliner. It compared more to a Yak-42 rather than to the SSJ, which is the superior aircraft. You can see on the frames how they are handmade Soviet style. The avionics are domestic. The plane itself is of Aviant design, but in cooperation with Russia. The major issues have always been the D436 engines as well as the flight control system. There were several issues engine related and on "scare me to death" issue with flight controls on "01" departing LED.
I also was operated Soviet style, never go de icing and compensate with speed and pilot skills, hahaha. Also it was fllwn often out of trim limkts, with it being very nose heavy and a little aft compartment, most weight went to the front.
If I had to speculate: 5% pilot error, 35% engines, 60% flight controls.