The Hipmunk display is really aimed at making it easy to pick the best option time-wise when there are multiple options at roughly the same price.
OTOH, what really put me off Hipmunk was not finding cheapest flights, compared to Kayak. I put in a multi-hop international flight, and Hipmunk is giving me $4479 vs $1786 on Kayak. That basically means "do not use" to me.
My search: NYC DXB on Sun, Mar 20 DXB MEL on Thu, Mar 24 MEL NYC on Mon, Apr 04