To be honest you only need 1 other person to grp with who is dps based and you will fly through. I had tremendous fun with a warlock.. chuck on stoneskin & blessings and just follow him around leaching the xp as he nukes entire zones!!
For soloing you can also get some nice dps gear - go for spell damage etc, and respec AAs temporarily to max out the nukes lines... OK, you won't be as fast as other classes, but it's not too depressing tbh as long as you have a little patience. And Rok is solo heaven quest wise, so once you hit mid 70's head there and have some fun
