X works a340?

Good morning,

I just realized that the X works A340 is really bad. I was about to take a flight from Zurich to Johannesburg. The first thing I noticed right after takeoff was that the plane was juddering the entire time. When I engaged the autopilot, the plane didn't have enough thrust, and when I tried to adjust the altitude, the plane either climbed or descended at 8,000 FPM. It couldn't be worse. Now I'm disappointed again that the plane won't fly.