I think they've made them easy as the dungeons are all part of the main questline and you have to complete them to proceed. If people were wiping constantly on the early dungeons in the free month they'd be unlikely to subscribe.
To be honest they are too easy though. Twice on my main questline dungeons the tank has dc'ed or left at the start and my DF group have mangaged to complete them pretty easily one player down with topaz carbuncle tanking.