I've never tried the dragons, but I took a level 10 rogue into Chardok and most of the way through it until I met a Chokidai Mangler. Even then, I got quite close before it aggroed (maybe I had been keeping to the rear 270-degree arc instinctively) and killed me in a single hit.
To be fair, you can /con the mobs to see if they will aggro. You may have to drop sneak for a moment, but the game will tell you if a mob is aware of you long before you enter aggro range.
The only mob to watch out for while you learn the ropes, the first experience many players will have of a mob which sees through hide, would be the Royal Guards in Crushbone; they are invisible too, meaning that they tend to see you before you see them and attack in pairs. Worse, they hide in the tunnel up to the throne room, so they will often drag some high-level (compared to the level of players in Crushbone) mobs onto your head.
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Mentathiel Rogue and haunter of level-inappropriate dungeons
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