I (PC user) just terminated all saves at level 19 ~ 30+ some hours because of so many errors: Some were trivial set up errors from errors in import history and some may have been corrupt saves that may have also introduced an error carried forward. Clearly the import function needs work - I recommend a manual setup of the keep. However, the number of NPC's missing from quests was beginning to get VERY bothersome and some boss creatures throwing up barriers continually before you can do any real damage indicates some foundation error may be at the root.
There seems to be a problem in how the system interprets quest complete with the missing NPCs in particular. For instance someone in your quest is arrested for crimes before you finish that quest - you can't report back and another open ended quest.
The first 2 dragons did not seem to be a problem other than taking WAY too long, but it gets worse. "Call me ?imachel?" is an example: his barriers go up before you can even get a nibble on that last 10% of his health. Maybe if the NPC fighting strategy worked correctly that would not be an issue and maybe a co-op human team could pull it off ...
Not sure how this fits, but it is a bug in NPC team member behavior that causes them to run into you and cause you to fall out of bounds or get killed. They need to be toned down a lot at rest- take a chill pill, so to speak.
In battle the NPC team members are not using their skills properly. Varric does not keep his range, Cassandra does not roll to avoid damage reliably, both die at the drop of a hat. I even tried copying Blackwall's specs and she still dies too often - Cassandra's behavior code is not working correctly.
All of them get backed into a corner too easily for a demon to just make jello of them.
They seem only aware of the first potion and never seem to use the others.
The tactics activation often behaves at random and is very bothersome -it needs it own key to toggle it on or off. NO mouse triggers related to shooting or repositioning!
Spending ~10+ minutes casting lightning at a dragon (did I mention underpowered) from range should not ever trigger the tactics, but it does so anyway and constantly distorts the viewing angle. I was thinking of writing a macro to cast the spells as this was so boring!
A note on underpowered for multiplayer IDK, but single player a level 1 mace 166 damage and level 3 staff or bow only 20 to 40 -clearly not balanced. The one handed sword is also slow to level.