Couldn't agree more.  If I hadn't already seen some very good to great depictions of this character in movies and TV, this Phoenix version would be of interest.  But. I'm. So. Sick. Of. This. Character.  Batman too, for that matter.  It doesn't help that the first Burton film linked the two characters so that it seems mediocre screenwriters feel the need to turn to the hoary "two sides of the same coin" trope.  One of the better things about the MCU is their willingness to mix things up re: antagonists.  (To your point re: the Green Goblin, I greatly appreciated the turn to the Vulture in Spider-Man: Homecoming.)

Burton's Batman became the generally accepted template for a wider understanding of these two characters in film, which is what's under discussion here.  Their association as men who have taken on a bizarre, frightening appearance and haunt the streets of Gotham at night is there from the very first Joker story in Batman no. 1.  Perhaps it's a matter of taste as to whether making that association more obvious is good writing, but I believe Batman/Joker stories are richer and more complex when the association remains implicit rather than made explicit.  

The very direct linking of these two characters made in the Burton film (i.e., that the Joker killed Bruce Wayne's parents) is far more spot-on and direct than the notion (not set-in-stone "rule") that the protagonist and antagonist should be similar in some important way (which has been done time and time again in literature and film, often very well - I never claimed to do so was in and of itself a mediocre writing strategy).  And to cleave to that in a reductive way has been the strategy of some mediocre writers ever since.  Note that not only does The Dark Knight not do this but, to screenwriters Jonathan and Christopher Nolan's credit, the film provides no backstory for the Joker.  The question "Do you want to know how I got these scars?" is never definitively answered and, in this, the Joker remains a more mysterious, incomprehensible and thus threatening figure of chaos.  

Imagine if Noah Cross had in some way been responsible for J.J. Gittes first tragic foray into Chinatown that is the heart of Jack Nicholson's character in Roman Polanski's Chinatown.  That's a silly notion that takes away from Cross's symbolic value as an unstoppable force of capitalism and Gittes as the Everyman victim of modern alienation, per the tropes of film noir.  Similarly, to reduce Batman/Joker stories to an explicit conflict between two men diminishes the underlying social themes of the Batman mythos.  He is a character after all who shares many of the same pulp roots as the noir detective. Young Bruce doesn't declare that he will bring the killer of his parents to justice but that he will wage war on all criminals.  Having his parents' killer remain an anonymous agent of modern, urban crime is more interesting to me than that he is the protagonist's primary antagonist.  But, again, to each his own.  

The usual tactic is to pit him against someone more destructive so that he looks good by comparison, like in "Suicide Squad." People cheer for underdogs instinctively.

The trailer makes him look like a powerless victim.

Those Nolan films, amirite.

I was trying to figure out why the trailer was giving me these familiar vibes even though I haven't seen it before.  Then I realized that my reaction to it was exactly the same reaction I had when I saw the trailer for Venom.  The whole thing feels like they took a script that could have been a more generic genre film (sci-fi horror for Venom, psychological thriller for Joker) and shoehorned comic book elements into it in order to cash in on the Marvel or DC connections.  I feel like I would actually have more interest if they took all the DC comics elements out of it and just made it a generic thriller about an unhinged comedian.  As with Venom, the appeal of Joker is how he stands in contrast to the hero.  It's a shame, because it actually looks like a decently made film, but for me they are ruining it by trying to make it a film about a Batman villain without Batman.

I feel like people would just view it as an unofficial Joker origin film still.