Maybe it's the PC mouse & keyboard controls or maybe it's user error, but the way my KE inquisitor would sometimes turn around and face the wrong way while trying to hit a monster,to the point she'd start moving out of range. I can't imagine making an actual warrior or DD rogue because of the clunky controls (or the clunker user--who knows).
The fact that the scaffolds are never removed from some areas of Skyhold even when there's maxed influence.
That goes for the broken chandeliers, etc., never tossed out or put into use.
The weird library, dining hall and other places throughout Skyhold that never see use (if they do, I never triggered them).
The way a cut scene would take you away from the area you were in and leave you stuck someplace else--usually the area you just escaped in order to go talk to someone.
The 7,389 giants in Emerald Graves that respawn too quickly and are far too close to the dragon.
That blank wall in Solas' room. Finish the damn murals!
Your companions traipsing into the water in the swamp when you are low level and out of potions. Why, hello 1,032 corpses.
My deluxe edition armor and weapons that are soon eclipsed by what is dropped or can be made in-game. They should scale while the inquisitor gains levels to make them worthwhile.
The fact that nearly everything you craft is an ugly gray or--worse--the colors show through for a companion but not for your inquisitor because the armors just have to look different on each and every person.
No real black hair. The fact that when I chose what I thought was the darkest brown it looks more auburn in light. The horrible eyebrows.
The way everyone walks in cut scenes like they're bow-legged cowboys or hunch-shouldered. Someone needs to teach them posture.
And as others have mentioned, the broken Hold Position.