Oh shit ..
a dragon randomly attacked me when I was just walking around a town shopping for shit lol, all the NPC's and guards joined me in the fight .. it killed a few people too (hope none of those was a quest giver), but damn if it wasn't awesome seeing a dragon coming up and down over the horizon, perching over the church building, swinging around the tower then randomly picking up one person off the ground whilst flying and toss him a hundred feet in the air, just straight up breathing fire and the whole town running around shooting arrows and shit ..
but obviously in the end it was my dragon shout that brought it down to street level for dual wielding mince meat (sm1). Adrenaline Rush is a great combat ability, it refills the stamina bar instantly allowing massive damage dealing power attacks to be spammed quicker.
The random dragon encounters is by far the best thing about the game, so damn awesome.
edit : the graphics man, sure the textures aren't the best thing ever close up, but DAMN if that scenery doesn't look amazing .. a really good early game moment is when you're doing the 7000 steps quest (and yes they really ARE 7000 steps), and you're going all the way up the tallest mountain. You can see some pretty amazing scenery, funny thing is everyone who was around me standing there watching me play the game pretty much stopped and looked at the monitor (because i was mostly doing "cinematic" angles, watching the scenery whilst climbing and shit).