Buffalo Wild Wings doesn't have their own delivery, they are using a Grubhub/Seamless service where Grubhub/Seamless outsources delivery people. So I won't blame them on the delivery/service, but Grubhub/Seamless itself. My order has been timely every time. My food was completely wrong once (out of 60+ times as of this review), and I got a 100% credit in a timely manner.
You modifications are hit or miss, but nothing that really bothered me.