I've tried to come back twice now. The reason I keep leaving is because of the population. There are MAYBE 20-30 people on at peak times. However, they are all, and I mean all in their guild homes, off in some random wood/mine collecting resources.
Everytime I would ask in chats what's up, I would get two responses... they would be "mining" or "gaining X skill in my house"
Other than that I saw maybe 3 or 4 people every couple days around luna,fire,abyss..etc.
Now I only logged on for an hour at a time so my opinion is based on that, but that time was around 7-8pm eastern time.
So to answer your question. The game I'm sure is fun, looks like lots of changes, but the population on Siege is VERY low.