the MD-11 may not be a "dangerous" airplane as it has managed thousands of perfectly good landings. but, just the fact that you need specific training and honned skills does imply that the plane is less forgiving than your average 737 or... 747 (to stay in the "heavy" category). Since the error margin is narrower, it just becomes more difficult in tight situations.
Every transport category airplane requires specific training and skills to fly. The MD11 is no different in that respect. The MD requires no special skills. It does require strict attention to being very stabilized during the final approach and landing phase of flight. That is also true of all large airplanes. Any competent and experienced airline pilot should have no trouble with the MD11.
Most, if not all, of the landing incidents or accidents relating to MD11s can be traced back to an non stabilized approach or a destabilized landing.