The question is fairly bad, but reneging on the offer on your first day on the job isn't all peachy either.
Perhaps it would've been better to hold off on accepting until you have had the responses from every potential employer (Source: have had people not show up on their first day of work way too often)
Perhaps it would've been better to hold off on accepting until you have had the responses from every potential employer (Source: have had people not show up on their first day of work way too often)