I suppose it's worth saying that I feel it should be far tougher to take down something like a full grown dragon than it tends to be in most d20 games I have played.
In my 4E game, every Dragon gets a Class (or sometimes a Functional) Template right off the bat, and many of them have followers, traps, fortifications, etc. The one creature in the game that I make sure is never taken for granted is a Dragon, even if it is lower level than the party. The game is named Dungeons and Dragons after all.
