Derren said:
But what I find really funny is that everyone says that 4E is more tactical but monsters (at least dragons) seems not to be allowed to behave in a tactically smart way because that is anti heroic.
Actually, they can behave just as tactically smart as a DM wants them to.
Let's take the Young Black Dragon for instance...
He could turn on his cloud of darkness, and fly 7, making it almost impossible for the melee or ranged people to hit him. Sustaining it is a minor action, so he could fly back within a short distance, let off a breath weapon, and then next round fly away, waiting somewhere between 1 and 3 rounds until the breath weapon recharges; heck, given he's clumsy maneuverability, he probably needs that long to turn around for another sweep anyway. Keep doing this ad infinitum, never remaining within melee range for more than a round, cloaked in a cloud of darkness that grants him effectively a +10 to melee attacks, and makes him immune to ranged attacks (because you don't have line of effect to him). He's not immune to area attacks, though, so his best bet is to take out the wizard first however possible, avoiding coming within range of the defenders in the party.
Now, what I've ignored is the fact that MOST of his abilities are melee-oriented. He's forgoing all his biting, clawing, tail slashes, etc. that can make hamburger out of an unprepared party. If you're thinking in 3e terms, a dragons best weapons are his LONG-ASS BREATH WEAPON, and his spells and defenses. He stays ranged as much as he can because a 3E dragon of appropriate level to a party just does not have any melee staying power; he'd get flayed to bits by a proper fighter, barbarian, or melee-type. The 3E dragon who enters melee instead of using his breath as much as possible gets his head taken off.