I try not to reply to snarky comments, but - it's not noticeably worse than other days, unless you want to go shopping in the biggest mall in the center of the city.
Both things can be true - I can be indifferent or appreciative of stuff being closed on Sundays and I can also be annoyed that 90% of the people have their only free day on the same day and thus bigger shopping needs to happen there instead of being spread over two days, unless you take days off.