Too bad about the weapon, but at least it's sounding like it might be as fun as it was in DA2! 
heal (devour) is less powerful in DAI but has a much shorter CD
What i don't like the AoE damage. IN DA2 (and DAO) it was around you,so you can move free on the battlefield and it used HP. In DA is a static area you mark and it costs a lot of stamina per second. It's ok if you can attack enemies because you get stamina back each strike but if you have to move and you don't attack someone for 3-4 seconds you waste a lot of stamina.
Honestly i'm not using ring of pain even if it gives nice bonus
Dragon Rage (the abilty that replace your basic attack) does a lot of damage but costs HP and if you are a 2H warrior/reaver you will be squishy like a rogue and the HP you use to attack will hurt you a lot. You need to keep guard high
Dragon Rage also have a bad animation. After the third hit (that is double) the warrior stops and you have to release the button and then press it again. you can't just keep it pressed like when you attack with weapon.