Airbus A321 Feels Difficult to Fly

I was wondering if anybody else feels that the airbus A321 seems more difficult to fly than any of the other aircraft. When I try to fly the airplane without autopilot, it's very difficult to control, especially on landing after disengaging autopilot. Also, after takeoff, the plane dips downwards before coming back up. Very strange occurance. is this a bug or the nature of the plane? Thanks!