Some Questions Regarding Guild Wars

[Ethelinde]

I would like to know the most effective method to take down fighters/mages/clerics if any archers with more experience in guild wars would like to share the information. So far my archer can rip apart most fighters and clerics around the same level but is having troubles with mages and some pure END clerics. Also from chatting with a lv 50 cleric I've heard that a cleric can take on more than 5 characters around the same level later on, is there any validity to that statement? P.s. please share on how you fight (do you stand and shoot or do you kite? DoT attacks and long exhaustion battles against them or direct firefight? Out in the open or snipe weaker foes???)