Of course it's harder - in ME3, you could afk in front of a boss for 5min without him getting through your shields, whereas the brilliant AI in DAI will deplete your potions and die within 30s (Sera and Iron Bull), leaving me to fight the final boss dragon with just Blackwall and my knight enchanter.
I also seriously question the AI - who, at Bioware, figured that a good default behaviour for the archer is to get into melee range and shoot the boss at point blank range? How come no one noticed that her AI is basically: "1: Use potion 2: Suicide"?
True, but that ain't exactly casual now is it? Casual is for people who want to go out there and kill stuff, not spend ages tweaking their AI behaviour.
Use tactical view, or press tab. If you click on them you do technically select them, but you will also execute an attack making it unsuitable for picking which enemies to attack. The number next to the enemy's name is their level.
The only thing that isnt Casual is the lack of proper tutorial of the systems. Once you understand the limited tactics, proper party structure, barrier, and guard, the game is not hard. Not even remotely. The AI isnt even as bad as most people make it out to be once you understand it all.
OF course that's a big screws up on Bioware's part.
What im gong to tell here isnt required to play on casual. This is stuff I figured out playing hard. But if will make casual a joke.
Set up your party like this and you can play casual with very little use of the Tac camera. Tank defends itself, Mage defends tank, Main character defends itself, secondary DPS follows main character. Make sure your tank goes into the tree with Rally and Challenge. get the guard producing abilities. Make sure your mage goes into spirit and gets barrier and its upgrades.
Start the fight with your tank going into the middle of the groups, and then as the main character, you should focus on the rogues and mages. Your tnak and mage will handle the heavy targets.
So the only time you need to go into tac camera is the start of the fight. And honestly, even then you could prob just skip it if you wanted to, but you'll have to use a few more potions. Following my strat, you wont use many.
If you are playing a rogue, I highly recommend evade. 2h warriors and their AOE is your only weakness. Get in, hit hard, jump out when he winds up that aoe swing.
For items,. make sure your craft weapons and armor for your tank with the mastercraft items that give guard on hit.