Even if he's talented, his preview tells me that he is just going to do his take on an incredibly stale formula. Is it possible that he'll have some snappy dialogue and fun action scenes that make his take on this incredibly stale, tired formula a bit better than it should be? Sure, I guess. But I won't be around to see it, because I'm sick of this formula. I don't like the idea that Stark is an alcoholism-incarnate character whose addictive tendencies and narcissism costs him inanimate objects like money and drives his friends away until he learns his lesson for the umpteenth time. And that's the formula it sounds like he is just doing his take on.
I prefer movie Stark: a mad scientist in a flying tank who suffers from PTSD from the deaths of many people he cares about, and the fear that the people he currently cares about will die and it will be his fault. A character who, above all else, doesn't want the people he loves to die. A character whose PTSD fuels everything he does, from becoming Iron Man to creating Ultron to signing the Sokovia Accords to sacrificing his life using the Infinity Gauntlet. All wildly different acts, yet all fueled by his PTSD and obsession with keeping the people he loves alive. THAT'S the formula I've grown to love. And that's the formula the comics clearly have no interest in adopting.
The formula the comics are obsessed with is, Stark is alcoholism-incarnate, and his addictive personality and narcissism constantly makes him friendless and broke, until he learns his lesson again. It wasn't an interesting formula the first time, and it's now incredibly stale. So here's Duggan and all signs point to him just doing his personal variation on this stale, stale formula.
In short, even if Duggan has the talent to not be a hack, he has already declared his intention to be a hack for the duration of his run. He's just here to hack out his variation on this formula.