BH - If you have non-structural panels attached to structural sections, and those non-structural panels are on the outer areas of the structural members, where the most lineal movement is encountered during wing flex; it's not unreasonable to expect those non-structural members to develop minor cracks, that are of no concern.
These cracks rarely propagate into safety-threatening levels, and the attitude of Airbus towards these cracks recently found, seems to be quite reasonable.
Let me know the aircraft that you examine or fly, that does not have one minor non-structural crack in it somewhere, after several thousands hours of operation.
The A380's are in commercial service, and racking up the hours. The facts remain, that the only problems encountered so far, have been the engines (supplied by an independent supplier)... and this minor, non-structural cracking.
In an aircraft that is a totally new design, and of such size and complexity, I would say that the performance of the A380 to this point in time, is outstanding.