I'm about 10 hours in, playing as a DW rogue on hard difficulty. My early observation is that the DW rogue plays a lot like the DA2 version, but it's a little trickier because the game is a bit harder than its predecessors.
The key to playing DW (true in both games) is weaving in and out of combat as the situation dictates. It's a very finicky class, because unlike everything else (except maybe two-hand warriors) you rarely want to be in the position of just autoattacking. Autoattack is fine for ranged characters waiting out cooldowns or tanks, but DW rogues will get their asses handed to them if they just mindlessly attack someone for a while. Instead, you have to pick your moments, and when an opponent's back is turned or a mage is focused on your tank or a defender is knocked to the ground or whatever you strike with everything you've got. When you do that, you can do really stunning amounts of damage in a short amount of time. Then, when you draw aggro or find your abilities on cooldown, you should get the hell out of the way (which can mean running away, going into stealth, evade, frankly whatever strategy or skill you prefer to use).
Obviously there's more to it than that - I plan to spec mine as an artificer and I really want to add traps to my repertoire, and I love using poison because you keep dealing damage even after you disengage from an enemy - but if you play like this you'll find yourself using your DW rogue to run from opponent to opponent as the fight dictates dealing out lots of spike damage. It's a very useful class when you see an enemy closing in on your squishy mage or a couple of enemies with tower shields head towards your tank.
The biggest downside of a DW rogue is the class takes LOTS of micromanagement. They're squishy, so if you don't pay attention they can die fairly quickly, and you have to think about what you're doing (taking into account cooldowns, enemy attributes, etc.) to get the most out of your abilities. By way of contrast, even though the personal touch always gets the most out of a class, it doesn't take a lot of forethought to rain fire down on a cluster of enemies. For a variety of reasons, included practice, this class gets easier to use as the game goes on.
Now, I'm still early into this game, so maybe things will change. But to me the DW rogue here feels very familiar to DAII.