I was much more of a PVE player in Destiny, but I was generally kind of disappointed by Destiny's Crucible. I think, coming off of how varied Bungie made Halo's MP, I was expecting more chaotic, free-form modes. I understand it's not in line with the MMO / character progression theme to do so, but I would have liked a Forge-style feature in the game. Destiny was a little too much playing on their terms and not enough playing on our own terms.
That being said, I'm excited to see what they can manage with Destiny 2's Crucible. They seem to have a pretty good idea about what went wrong in D1, and what they can improve upon, so I have faith they'll make it something worth investing time into.