i'm more ok with the underground pass than the bullstuff layout of tirannwn. i've have to go through the underground pass at least 5 times today just because there's no banks at all and i've had to tele to ardougne
I haven't played in more than 5 years, but I remember Underground Pass being miserable. It's one of the coolest quest ideas ever and they drag it on so long that I desperately wanted it to end. The crazy cool Elvin forest with traps was awesome, however, and definitely worth the effort.