Being in the same line of duty, I feel obligated to defend the unnamed men and women working on that site. Designing a system that can sustain periodic bursts of activity, while having very limited resources is extremely hard. We don't know the circumstances leading up to this failure. We do know however, that DV is often plagued by a large number fraudulent entries. If "agents" are submitting all the entries using just a brute force, that may easily lead to DDoS. Just be patient. There are 3 more weeks to submit your entry.