One thing I did not enjoy about the alpha and beta builds was the sense of isolation and loneliness I felt. Usually I only saw 3 or for people in old Russia. Since Destiny is going to be a FPS MMO, I think it should do a better job of living up to the MMO aspect. Each instance and server should be able to have a 77 player capacity. That way I will feel like I am playing with a community and it will make public events feel like a big battle or that I am exploring Bungie's world with an army of guardians.
My God this is the worst possible suggestion. Imagine trying to get to objectives with EVERYTHING cleared out already because of the insane amount of players in the zone. It would be extremely boring and unsatisfying. The only TRUE MMO aspect that Destiny has is raids and competitive matchmaking. I hope they keep it that way.