And I felt I had an obligation to defend my preferred game, so no harm and no foul. Anyway, Guild Wars does things a mite(or so) differently. Each class has it's own unique stats, which are one primary stat and then various other stats that compliment the various types of skills your character can use. Rangers have Expertise(Primary), Beast Mastery, Marksmanship and Wilderness Survival. Dervishes get Mysticism(Primary), Earth Prayers, Scythe Mastery, and Wind Prayers. When you dual-class, you get all stats but the primary stat of whatever class you've just taken up.
A Ranger/Dervish would have Expertise, Beast Mastery, Marksmanship, Wilderness Survival, Earth Prayers, Scythe Master and Wind Prayers. And so on. What makes this interesting is that thanks to this, any class can dual as any other class without issue. But still, stats are nowhere near as important as skills, which the game handles rather like a CCG. You get many skills from your class instructors in the start of your character's career, but after that you must find them, rather like a CCG. And while each class specializes in certain things thanks to these skills(Interupting Ranger!), using these in new and different combinations is, in fact, easy and possible.
If I have it in my head that I can combine the Warrior and Elementalist Classes, that is, combine a Tank with a Caster to milk a few skills from the Caster class, I can. In addition, the basic roles of each class are often only three or four out of my eight. If I want to add some Ritualist to my Ranger so that he can Interupt enemies and then buff allies and summon damages soak spirits because there's always going to be that one Assassin who pops up next me and decides to DPS me, I can do so without affecting my performance as a Ranger.