You have been refunded for MORE time than the servers were down.
If you were unable to play during the times the game servers were running that is not a direct fault of the developers.

I mined during the DDoS (Not to have it hauled for free because I have a Nexus/Hauler alt, wheee).
I shot NPCs and it was lots of fun but a little scary that the servers could go down at any moment.
I went to work (And watched the activity graph tell me that everything was okay and all was well on the server)