Magenta...the color of righteousness!
Agree or disagree: group quests are okay for current expansion content, and should be returned to the game.
While I think that it's okay, mostly, that former group quests in wrath era content and prior have been made solo-able, I think the lack of these quests in the open world definitely take something of the spirit of it being an MMO with a community away from the experience. As I was leveling my eleventy-billionth toon in Zinth'alor the other day (and cursing the developers for not retuning respawn rates), I remembered back when it was elite, and you needed at least a couple other party members to make it to the top. While I don't think the rewards offered for that were ever quite commensurate with the effort, I think that that's easy to remedy, and having more opportunities in the world to take down moderately more difficult quest and zone content beyond world bosses would be awesome.
I think that the open tagging system is a good compromise between group questing and soloing. You don't necessarily need to assemble a group for it, but anybody can pop over and participate if they're on it too (and especially early in an expansion, other people will be on it).
I do kind of miss group quests -- there's something about putting a team together and tackling a tough mob -- but boy was it a pain. I don't know if it was the same for everyone, but there were quests I simply never got to do in vanilla because I could never find a group and they were literally impossible to solo.