i have found that monks are highly necessary in PVE by virtue of the fact that most players in Guild Wars royally suck at PVE and hence are guaranteed to die without at least 2 monks in every party in the later stages of the game

an example to illustrate reasons for such a necessity: i think i am the only tank who i've ever seen run away from a mob that is hopelessly decimating our party in PVE. i've been in millions of parties by now. which makes it all the more shocking that almost no one i've came across is smart enough to know when to retreat.

most just stay there getting pounded til they die even though there is zero chance of winning the encounter

of course the people who post at this site are probably a lot better than your average (horrible player) bear, so mileage will vary if made up of all Org peeps