Have you seen the dragons of Dark Souls?
THEY ARE varied, powerful, and have different battle tactics... and they are rare.
Really? I killed the one in Undeadburg just by shooting it a few times with the Blackbow of Pharis. It didn't even have any "Tactics". It just did the same flyby fire strafe, which was pointless because I was on the underside of the bridge pelting it's ugly wing.
And the one in Valley of the Drakes guarding the Straight Sword of Artorias was even easier. Just wake him up, and pelt him with more arrows while he does
absolutely nothing.
And then that brings me to Seathe The Scaleless... First a Rigged-to-loose Fight, and then when you get all the way through that god-awful cave with the invisible bridges, you can roll over Seathe just by getting behind him and repeatedly stabbing him while he tries to turn his fatass around. Bonus points if you can get the sword by chopping off his tail solo like I did.(On accident on the first attempt to boot)
Assuming you don't just Ironskin cheese everything, Dark Souls has a lot of challenges... Dragons are not, and never were one of them. Their dragons
svck! (And are really ugly)
Now on topic. Give Dragons moar shouts. I'm not sure if there's some kind of framework in place with Dragons that makes it impossible for them to use Dragon Shouts in game, but could you imagine how much harder they'd be if say, a Frost Dragon could Ice-form you, a Blood Dragon could dismay shout your allies away, or an Elder Dragon that could use Marked For Death?