Here’s a CoF P1 video with 4 zerker rangers and 1 mesmer (using normal weapons)
Discussion here:
http://www.guildwars2guru.com/topic/84081-cof-4-ranger-1-mesmer-normal-weapons/
The video starts a bit late but we made the run in about 7 minute / 7:30, but we could have done it a bit faster since it was the first time we played together and there was no organisation before starting the run