Firstly, what PvP are we discussing here? You won't find a dervish a much sought after profession in high 'tier' PvP (GvG, HA) unless the monthly skill balances swing to their favor. However if you are going for casual PvP such as AB or RA, basically anything goes as most of the time winning is always dependent on your luck of having good team mates and stupid opponents.
As for PvE, any profession is as good as the next. You would be better off H/Hing than looking for PUGs to PvE since majority of them are too thick to improvise their builds and are as disorganised as a bunch of nursery children.
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