I enjoyed the Crucible, especially Iron Banner. Nearly reached rank 2 in Iron Banner and I got all 100 creds from the Crucible. There wasn't much difference between the classes because of exactly that, we didn't get to level up high enough to really get into what makes each class unique. Most of Destiny is gunplay, so since everyone has the same weapons and gear, there wasn't much difference outside of the Supers and looks.
I didn't get into the story itself. I mean, I like the universe, the Fallen, Hive and whatnot, but not the personal story. All that I remember was that I was revived, went to the tower, and then became an errand boy/girl. I mean, of course it is a build up to the actual game story, but as for right now, I wasn't that thrilled by it.
Main 2 complaints (well 1 being from someone else), is that A: It would be nice to talk to people outside of your fire team, because doing Devil's Lair or PvP with people who don't know what they are doing is a pain since you can't communicate with them. B: They need a form of ranking in PvP so that you aren't pared with people to far away from your skill level in either direction.
Judge not, that ye be not judged.
For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again.
And why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye?