It was too long and the plot gets contrived. I can agree 100% with that.
But tons of the criticisms I see, like... "characters act dumb" and "the fight choreography was bad" just make me shake my head. Like, clearly you're missing the point of this show. It's not a superhero show about pushing through your limits to save the day, it's about a woman with PTSD trying to come to terms with her past abuse.
Like, is Jessica an unlikeable, selfish wreck? Yeah. She was held captive by a psychotic, manipulative rapist for months. Her friends are a child star with an abusive mom and a recovering heroin addict. They make poor decisions. They are not people you aspire to be. Do these decisions get a bit contrived? Sure, but it's for the specific purpose of challenging the characters and raising interesting questions. It's not perfect, but it works.
Criticising Jessica Jones for having bad fight scenes is like... I dunno, shitting on Daredevil for having undercooked romance subplots. It's not the point of the show, it's a means to an end. Would the psychological profile of Jessica be improved by watching her mow through a bunch of goons with kung fury?
I suspect the biggest reason GAF hates on it is because they don't find "troubled rape victim" a particularly relatable character, don't connect with the show, and are unwilling to forgive the flaws they find. I mean, it won a Peabody, got tons of critical praise. Just because it's not the show you're looking for doesn't mean it's a bad show.