According to the forums the new instances are bugged (at times can't kill the end boss in some instances, etc). Ie pretty much as it was when LOTRO was released, still remember my visit to the Great Barrows with my Minstrel during final days of the beta and it was bugged as hell -> not suprisingly it was just as bugged when first entering it first time in live with the Burglar (the very freaking reason I never got around to complete Great Barrows with him, grrr).