The marriage between MMORPG (if you can even classify this as an MMO) and FPS has been very well done, to Bungie's credit. Working in a gunplay system to raid mechanics and social play had to have been tough to figure out, as it didn't really exist in anything other than Borderlands. The biggest problem that it's created, though, is that in a traditional FPS (lets look at Halo), everyone starts off with the same stuff. You get a stick, I get a stick, and whoever's better with the stick wins. Loot systems inherent to the RPG genre, though, make for many sticks. Some players have sticks that other players can't get, and striking a balance here is almost impossible. That's why Crucible has been so fluid for the last 1.3 years. Probably, the best way to keep everyone happy (which is NOT to say the best way to keep things 'fair') would be to further diversify the playlists. I've seen a lot of folks asking for 'hardcore' playlists where everything is absolutely fair, but even then some would be offended by the seemingly lopsided advantage of some players. I suggest that Bungie refine its matchmaking system, such that you're more consistently matching with people who are similar to you in skill. Now, I have no proposition for how they do this, but since they have degrees in this shit (supposedly), I suggest they figure it out :)