It's more to do with their AI then anything else. I'm playing a pure mage. Haven't increased my health or stamina at all. Dragons are much easier then sabre cats, giants, mammoths, and any type of bandit/forsworn/mage above base level. Dragons never seem to focus on any one object for extended times, even when it's just the player fighting a dragon. It'll still let up its attacks and circle around in the air, allowing the user to heal without worry. And of course, my wards fend off everything but physical attacks.

Well, the lower types of dragon are pretty easy, but trust me, the higher ranking ones are hard as hell. I'm level 39 and pawn blood and frost dragons on expert with my legendary ebony hammer and steel plate armor(it has like 10 less armor than ebony when both are legendary), but when I meet an elder dragon I actually had to turn the difficulty to adept and I still had a hard time killing it.

Herp derp increase difficulty

Yeah, Dragons are tough on Master difficulty...at lvl 12 they were impossible to kill for me, now at lvl 16 I've killed 3 but they weren't easy at all.
The weird thing is that if I see a Dragon I put on my "Challenge Accepted" face and I engage the beast in a verry tough fight...if I see a ?°§#### BEAR, I start running the other way screaming like a child caus that furry beast from hell totally wrecks me lol

What level are you playing on ?

how can you be at master level already you have to be playing on easy.. I'm level 14 now and no where near master level in anything..

Have you been using trainers ?

Any way I'm not doing anything wrong just putting most of my skills levels toward Destruction.. And just using Ice storm, frostbite and some Fireball action.. This is how I always have done it since morrowind and I will continue to..

Not picking on you just curious that's all ( FTR )..

Wait for Ancient dragons before saying dragons are easy, yo. That thing swooped down and one shotted me. Just ate me in one big bite when my health was full. Didn't even have time to charge up my spell.
Edit: Also, Here is all the dragons:
Dragon-Level 10- Fire breath shout, fire ball shot- Resist Fire 50% Weakness to Frost 25%-905 health-37 damage bite
Dragon-level 10 - Frost Breath, ice storm shout- Resist Frost 50% Weakness to fire 25%-905 health-37 damage bite
Blood Dragon- level 20- Fire breath shout fireball shout, unrelenting force shout- Same as above for fire- 1421 health-75 damage bite
Blood dragon- Level 20-Same as above, just ice.
Frost Dragon- Level 30- Same as above, ice-1860 health- 150 bite
Elder Dragon-Level 40- Same as above, ice and fire blah blah- 2255 health- 225 bite
Ancient Dragon-Level 50- Same as above, ice and fire blah blah- 3071 health- 300 damage bite (Without enchantments boosts, etc, even if you focused on health for fifty levels, that's a two bite kill, and the bites come -fast-)

So yeah, calm yer nuts. They get stronger. Just also remember. You are also stronger, and you get used to their tactics.

Level 18 warrior. 5 hit dragons with ebony greatsword.