Overall, I loved the event. I participated on my level 40 and my level 50, both of whom got the DNA samples-purchased rakling pet as a result of their daily efforts.
I thought there was good immersion for players at a variety of levels thanks to having the news terminals and intercomm announcements on the fleet. I personally had a lot of fun with doing some in-character blogging about the event too on inquisitorsroadhouse.com since it was such a fun event.
I had one character's plague Origin quest get bugged, with the last piece not being clickable, which was not resolved by the end of the event, which meant she didn't get the rakling pet from it which was a bummer. And after having such a great iterative story, with new quests popping up each day, I was a little surprised and disappointed to have the event just sort of vanish at the end. I guess I was expecting some sort of finale. The cap to the story arc could have been a big world event, an all galaxy announcement, or even some sort of in-game mail letting me know that thanks to my hard work and DNA samples the plague had been contained. But these are minor areas for improvement. When I logged in and saw the plague had vanished, I thought I must have missed the end cap to the story.
Keep up the great work and please be implementing more of these in the future! A nice alternative to holiday events.