Have to agree with Smoooth here, I took a trial run through all 3 Auchindon instances this morning before work ^.^ and I don't think they are worth the extra effort. There's too many random secondary target effects (mobs that put SWP or mana burn on your alts) as well as mind control to deal with in both Crypts and Sethekk. The XP was somewhat better but more in the 10-15% range not a huge increase (part of that from the 5% tower buff, rest from the higher level mobs).
Ramparts has knockback deaggro and stun but both of those are easily dealt with, back to a corner and keep Consecrate down and mobs will immediately re-aggro. It's brainless.

BTW the XP for 1 full Ramps run at L62 is right at 10%. So 10 runs, 2 hours, easy. It's also worth doing the pre-req for the Ramparts instance quests (fairly short, check a database site for details) and then the Blood Furnace ones after that as they give a lot of XP.

One downside is that the reputation gains stop at 1 point shy of Honored, wish it went up through Revered as the discount on mount training would be quite welcome.