So, according to UESP wiki Blood Dragons should know and use Unrelenting force shout, but so far (lvl 25, Master difficulty) I've never seen one using it.
Frost/Elder/Ancient dragons shoul know/use it too, but they start to show up later in the game so I can't test it...
I was wondering: have you ever seen a dragon using a Dragon shout, other than flame/frost breath and flame/frost ball?

Not yet... I'm at lvl 40 with 95 hours played.

Same.

So far its been either:

BUUUUUUURNNNNNNNNNN

or

FREEEEEEEEEEEEEEZE

with the occasional wing slap and tail thump.

Killing the Dragons too fast? I'm sure i've seen a Dragon shouting but it may have been a named Dragon.

Never seen a dragon use a shout in combat yet. Level 20

Dragons really are too easy to kill at least at lower levels. Wish Bethesda buffed them just a little. At least make them use shouts and special attacks

:D

No, as an assassin, fights on Master are tough so I'm not killing them fast, at least Blood Dragons...
I've even done some testing during a dragon attack on Dawnstar...Blood Dragon Vs A LOT of npcs and it didn't shout anything beside breaths and balls.

Guess UESPwiki is wrong about dragons using shouts...and I'm a little disappointed about dragons not knowing dragon language lol

Try rolling a different class, I used to tear through them with my warr type character, as a newly built archer class, I get my ass handed to me.

they should really be rebalanced a bit so its not too hard with one class while too easy with another.

Well, they could be more balanced/hard if they actually used shouts...just a Blood Dragon using Unrelenting Force, stagger you then bite/full breath would make quite a difference...