Oversaturation. I don't mind her showing up in titles where she should show up, like anything connected to Task Force X, Joker, Batman, Gotham City Sirens, Sanctuary (coz everyone's there), the Specials, or Brainiac's made-up Justice League, but having her sit in the Hall of Justice alongside Justice League members after Superman's unmasking is crossing the line. She has no business there and she's not supposed to be there. It's already pushing it that she's supposed to be a Suicide Squad member with a neck bomb and can freely go anywhere.
From what I've seen, the Dick fans don't express any serious dislike for Batman, Joker or Harley, it usually comes from other quarters.
Though with DiDio being blatant about wanting to sabotage Dick in favor of Bruce, frustration is pretty warranted and the damage isn't magically gone now that he is.
Personally I loved her as a villain, I just can't abide how she has become an anti hero or such
Actually on reflection I just can't stand her nowadays to the point I don't but any books she's the focus of
Same situation as marvels Deadpool for me
Too much of a good thing
Strangely I don't think that of batman, but then I feel he is a far superior character
Harley could work as an antihero, but DC skipped over her redemption arc and opted to pretend she did nothing wrong or justify all of her crimes with the 'LOL crazy and randumb' excuse.
I'm gonna have to second everyone saying the main issue is overexposure. I like Harley so I don't particularly mind seeing her everywhere. But for people who aren't fans of hers to begin with, I can understand why the obnoxious pedestal that DC puts her on would lead to some extreme dislike.
As someone said before, her soloing the Trinity like they were nothing didn't really help matters either. It's kinda like the same problem people have with Batman and all of his near impossible feats.
In my case, I like Bruce for the most part. Especially his DCAU counterpart. I just find his supporting cast to be way more interesting than him. That and...I'm just not a fan of how he's been written for the past couple of years (thanks in part to Tom King).
I don't really mind Harley, but i really dislike the voice Tara Strong does for her nowadays. I don't know why, i think she is forcing her voice a bit much? I don't remeber disliking this much in the previous games. The trailer for the Suicide Squad game is painful to watch every time she speaks.
I prefer her original voice (that's about the only thing I prefer about original Harley) but Tara's has actually grown on me. Especially in Injustice 2.
I can't stand modern Harley. I think she is a terrible character that is way overexposed and gets shoved into too many books and stories where she ends up lowering the quality of them. She's been in basically every big DC story or event for years now, and I hate how they turned the Suicide Squad franchise into just a Harley Quinn promotional vehicle as well. The shift of trying to turn her into a generic hero and ignoring how she willingly joined the Joker and did horrible things has been so forced. Now they want her to be part of the Batman family or even on the Justice League because they want to sell her as a female hero. I don't think she is an interesting enough character to warrant such a massive push.