As many engineers will and do tell - the 744 in it's first years of Qantas service encountered a heap more of issues than the 380 has. New aircraft, new issues - big deal - look how successful the 744 has been and yet not issue free early on...what aircraft is?
744 dispatch reliability first few years 94.5%
A380 average is 96-97% fleet wide and SQ has achieved an average of 98.1%