The Legendary Dragons in the Dawnguard DLC for Skyrim seem to be lacking a certain trait I have come to expect from the game: They just are not scary. While it is pretty neat that they have added two new spawning dragons to the game I feel like the elder and ancient dragons are much more intimidating then the stronger Legendary. From a distance I often mistake the Legendary with a common dragon and cant really tell until im close enough to see the horns.
I also think its a little unfair to some that the legendary dragon does not appear untill the character is above level 75 ((lowest level I have heard of one appearing)). One didnt appear for me till I was level 78 and now the im level 80 they are everywhere.
This is just my opinion on the matter. Fell free to share you thoughts :)