What I liked was being able to experience a developing story at level 50 - as opposed to grinding dailies - and the chance to earn unique items and gear. I really hope to see more like this in the future!
What I didn't like was the sudden ending: I had read somewhere that the event would go on for a while, so I left for a short trip without worrying. However, when I came back the event was over and I hadn't spend any of my 75 tokens and I only had half of the orange gear set
What I'd like to see in the future: an alien race sending a recon-in-force as a prelude to an invasion, wild animals attacking, a virus that causes droids to turn on their masters, a supply crisis that requires players to harvest resources from a certain planet, and perhaps some non-catastrophic events, like a festival or a special trade post appearing on a planet. Just some random thoughts.