I just got to Mooshu but I still have like 7 side quests for Marleybone. Should I continue in Mooshu or go back and do the other quests?
I agree with Professor Greyrose, but for different reasons: you side quests will most likely boost your level by at least one. You will also gain experience battling different mobs. Mooshu is my favorite world, but parts can be fairly difficult if you get there at a lower level.
Depends on what level your wizard is. 25-30 = Do all of them so Mooshu doesn't take forever to do. 30-35 = Do 3 or 4 side quests, then go on to MS. 35-40 = You're good to go, Mooshu won't be hard for you.
On my first wizard ever, I didn't do side quests OR Grizzleheim, so Mooshu was a pain in the ol' tushy for me. Good luck!