What a lot of these folks are saying. If you've done none of you MSQ since 2.0 then you have a ways to go. But no worries. All level 50 quests now grant EXP. You'll just have to pick up with 2.1 and make your way through 2.55. Nothing to harsh these days. You'll earn poetics which can be spent on ilvl 120 gear in Mor Dhona.

Though the "required" ilvl to get to the expansion is 90. That being the case because the final "boss" fight for MSQ requires i90.