Is using stealth an exploit?

[Gurnsey]

... As I said in my original post I belive the problem is with druids being able to stealth. With this, you can sneak a tank a healer and a damage dealer into any area and bypass everything else. The ability to slip the "holy trinity" to the end of an instance is what I belive is against "the spirit of the game", not simply that a class can stealth around....
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I don't have enough experience with it, but I have the feeling that it's a LOT harder to sneak a druid through an instance than a rogue. Plus, if even one mob sees you on the way in, you're all dead - since the rest of the mobs haven't been cleared, you have nowhere to move and you are stuck with whatever bad situation you are in. I'm not sure how this figures into the overall question of 'is it right', but, if it's hard to sneak one druid in, and you need two (tank and healer), it's even harder, and at some point you might as well have just fought your way in, making the whole question of sneaking in more of a 'you could do it, but why?'

This whole discussion is quite interesting and I hope that it continues (civilly of course). It would make a good topic for a morals/ethics/philosphy/psychology paper, as I believe MMOG's are in general a good topic for this type of discussion - after all, it's a social interaction without any physical (visual/auditory) contact or physical consequences; not something you see in 'real life'.