It has nothing to do with being good or not at building airplanes. It comes down to physical realities.
That is exactly why the A380 will be successful. The question isn't whether the airplane is too big for the airlines ... the question is whether the airports are too small for the future. The answer is "yes". What I refer to is the fact that many airports are highly limited to the number of additional flights that could be added. All airports can handle additional passengers (with modification to baggage/security/transportation facilities). But most high-volume airports to not have the real estate (on the ground, or in airspace) to expand to handle significantly more flights. Assuming a growth market in the travel industry, the only answer is to have more passengers per aircraft.