So my quasi-experiment today.
My constraints:
- Only control the Inquisitor
- Do not use tactical camera
- Do not change from starting equipment
- Level up my characters if they leveled
- Also be a Dual Wield Rogue
- Be aggressive and look to instigate combat by jumping in with my rogue
- Do not intentionally use skill combos (Twin Fangs, for instance, does extra damage to a target frozen by Winter's Grasp)
- Try to leverage flanking by attacking targets from their rear. This would let my attacks do more damage, and also allows for some bonus effects to happen with Twin Fangs.
This was probably about 40 minutes of play time.
In the area where Mike/Mark had their first fight (Caltrops) I ran around and got into 8 fights. Most fights had 3 hostiles (I think 1 had 4). I used two potions during this time. The potions were used on myself and knowing more about the game (i.e. things I have learned by simply playing the game) here's how I could have avoided them:
- The first potion I was too aggressive and ended up surrounded by magical wards which actually did quite a number on me. These wards are casted by spellcasters and have markings on the ground. I could have assessed the situation better and been more careful to not end up in them.
- The second potion was because I had engaged a tougher enemy while Cassandra was tripped up on a nearby guardsman (the shield guys). The guardsman kept Cassandra busy and left me to solo a character. I could have remedied this by changing my target to help burn the guardsman, or using radial target control to quickly tell my entire party to attack my current target.
My 9th fight was the one that Mike and Mark did with the tactical camera. I used one potion here because those archers made me a pin cushion while we all beat up the first guardsman. I could have better focus fired the archers and leveraged stealth to help me avoid taking damage from them. If a guardsman is pulling your attention while archers shoot you in the back (I also shouldn't have exposed my back), then you're effectively being tanked 
Fights 10-13 were related to a quest that isn't too far from the 2nd fight Mike and Mark did. I used 4 potions here. Cass and Varric both used one, and I used two for my Inquisitor. The biggest thing I could have done here is focus fire. I made a huge mistake in fight 12 by effectively swapping targets by mistake, and having aggro on two characters. I should have looked to kite/disengage more at that point, and have the team focus fire and Cass taunt. But I did get through it, completed a quest and gained Inquisition power and found a very powerful sword (though I didn't equip it).
Fight 14 was against a group of animals. Used my last potion here (Varric took a heavy hit). At this point I was, right beside a new camp location which unlocks a new fast travel point for me and replenishes my potions in the process. So I actually never "returned to camp" since I just found a new camp.
Now, it is important to note that I'm not new to the game. So even if I try to play ultra aggressive or even "as a new player" I'm still going to likely have implicit actions that I don't even realize I'm doing. I'm not really a good judge of my own "mad gamer skills" but it's also possible I am someone that tends to do well with this type of combat anyways. At the same time, I have also improved my ability to play the game which (at least for me) is a rewarding aspect of the combat.