The busiest weekday was Thursday when 75,876 people boarded the driverless trains,which run from Rouse Hill in the north west to Chatswood via Epping and Macquarie Park.
Speaking on Sunday,NSW Premier Gladys Berejiklian said the vast majority of passengers had given the metro line a"thumbs up"in the first week of operation.
"We've seen half a million people use it in the first week alone. There's no doubt that there were some glitches and that's always unfortunate but we always knew there would be,"she said.
She warned some glitches were likely to occur over the next few weeks because"no matter how much you test a new system,it's always different when customers actually start to use it".
On Friday,a power failure temporarily halted services between Rouse Hill and Hills Showground,a day after a train broke down,causing delays to services. Passengers have also complained of carriage doors failing to open,and trains having to reverse after overshooting platforms.