I play on PC, with a mouse and keyboard (seriously the controls aren't THAT bad - attacking is essentially the same as Diablo, so I guess I've had endurance training from that or something, a bit awkward, but instead of complaining I just sucked it up and got used to them after a few hours, I actually like the no auto run to target stuff now....but spamming the search is tedious - especially since it highlights **** in yellow that blends with 50% of the environments) I beat Nightmare without turning the difficulty down (I also played with Friendly Fire ON), on my first playthrough pretty easily. Killed all 10 Dragons too. Played as a 2 Handed Reaver, Cassandra tanking, Dorian and Sera as my other two. Inquisition offers very little challenge, I think the problem for a lot of people is overthinking the game.
Something Dark Souls does very intelligently, is teaches its players, that they will, die, to expect to die, and that it is ok to die. So players go into a fight knowing they will die the first time, so its an exploratory thing. You die, but you learn something and adjust your playstyle accordingly. I see people here list their tactics for fights and they can't finish them...its because you've over complicated the encounter, and when you die, people tend to adjust their strategy up...in otherwords you compund the problem of over complicating the fight. Start fights as basic as possible, and adjust strategies from gorund zero, never start out complicated and try to prune. That said...
One thing a LOT of people don't understand about Dragon fights is the wing vortex ****...they try to run their people away...this is incorrect the safe zone is right under the Dragon (the eye of the storm), collapse your party in and you take ZERO damage during this time. Your ranged should not take ANY damage over th ecourse of the fight, as long as they are spread out from eachother (for Dragons with ring based ability).
Cassandra for me never died as long as Dorian was alive she rarely lost health (and it was fully restored by the heal over time potion anyway). I'm assuming you have to royally pooch your tank build for it to be any other way.
The only character who took damage (unless I missed taunts on Cassandra, or range AI depred and ran somewhere they shouldn't have) was my Inquisitor...from spamming Dragon Rage.
My entire strategy was spamming Dragon Rage until 5% health, hitting Devour, popping a potion back to full, I could have played safer and only needed healing from Devour, but it just would have made fights take longer. As is, every Dragon died in 2 minutes or less for me, I only outleveled the first Dragon (I did the Frostback when I outleveled it by 2), but its absurdly easy if you walk under the cliffs for shelter when it goes on top of the cliffs. The only micro I needed was when range AI derped, or for some reason Cassandra was "forgetting" to use Guard generating abilities or taunts.
IMO Reaver, Knight Enchanter, Tempest, and Assassin are all other bugged (Tempest) or heavily overtuned. I'm sure the game is more difficult as other specializations. But those 4 trivialize the content to an insane degree as long as you don't bugger your build really hard, or overthink the fights. I also think Templars are just straight up better Champions. They are better tanks, gives entire part damage resist and weakens enemies they hit.
In point of fact, the only fight I struggled with was the Haven battle, this was before I had unlocked Reaver though, and I did poo damage.
I've contemplated contributing to the wiki/writing guides here (since I currently have 100% of content completed all achievements unlocked and am on my seconde playthrough), but I've never really done such a thing before so I'll probably just leave it for the more experienced to do.
By the way there is NO reason to have defensive stats on your ranged, or melee DPS, ONLY your tank should have defensive stats from Dragon fights. Your ranged if you correct the AI when it goofs should NEVER take damage...there are is no global AoE damage (if you run to the centre during wing vortex), and your melee dps if you properly position him/her while attacking should be the only one in need of healing potions for the duration of the fight soany damage he takes incidentally is easily maneagable. Tanks who always have guard up should be taking literally no damage...especially Templar tanks (which I think are better than Champions).