With DAO being superior in terms of needing tactics thats a ridiculous statement to say it built bad habits and normal encounters. In real life, when you go through a narrow cave or through a building and you clear out enemies, enemies are only going to be in front of you, or were in high places or behind barricades, Of course the ones who are melee are gonna charge you.. Its plain common sense to keep your weaker party members back that attack from range.
In real life, absolutely no one is so stupid and so willingly walk into a killzone unless they have absolutely no grasp of tactics, they're actively suicidal, or they're actually wild animals driven insane by ... something.
The most basic military moves involve simple positioning to avoid head-on attacks, such as flanking, pincers, encirclement, etc. There is no such thing as a pitched battle where two sides moronically charge each other until their decimated. The best example of a situation where people departed from this was WWI trench warfare - and that was a disgustingly ineffective tactic that did nothing more than lead to hundred of thousands of deaths for literally go meaningful gain.
DA:O "tactics" involve (i) avoid powerful builds that complete obviate the need for anything beyond just simple CC and mage nuking and (ii) depend on AI so stupid that it blindly charges to its death in a kill cone.
There was a huge need to learn spawn points. Or after a while, and seeing how every fight was wave, needing to keep moving, but then that leads to really no tactics and eventually can turn into just a kite fest, which if there is any bad or cheap habit in MMOs or DA. its kiting.
Staying on the move in battle is a basic tactic. It is literally one of the most fundamental aspects of a military engagement. This is what I mean by DA:O teaching people pure nonsense. In a real firefight, one of the most basic dangers is getting pinned down and then flanked. Yes, in DA:O, enemies would be stupid enough to charge straight at soliders in cover to get mowed down in a killzone, but killing idiots running at you is not a tactic.