So basically what you're saying is, you like to do things one way, so everyone else should be forced to do things the same way? Because you'll still be able to grind mobs in exp parties if you want, nobody will force you to do these quests. And why does it have to be one way or the other? Maybe some people like both solo and party content. Also playing solo in an MMO =/= solo RPG. There are many things in an MMO that you can't get from an offline RPG, like the social aspect (linkshells/free companies) and the economy. By your logic everyone who crafts and gathers exclusively should play offline crafting games.
These quests might be leves for all we know, and even if they aren't, I honestly don't think we need trash quests for DoH/L, leves are fine for those. And I hope they aren't hand crafted so we can get more of them, considering that the quests in Skyrim were still pretty boring to me after a while.