1. Romantic progress: How many slice of life romances involve an infinity of hesitation, self-questioning, bullshit reasoning for why they aren't together, and lack of any progress over the course of multiple seasons? (screw you Uzaki-chan) This anime has real progress that doesn't get walked back or extended forever because of greed or bad writing. The leads are amusing and compatible as complete weirdos, they act like they're dating most of the story, and the show doesn't blueball the audience with wishy-washy emotional drama that just prolongs the courtship stage.
2. Humor: the main two are bona fide weirdos and the ML is well-written for magnifying the humor with his delusional scenarios and explanations for Aharen's oddball behavior and reticence. They go on dates, compete at silly games and sports, while ML hypes Aharen up and supports her for who she is. She is drawn to his open-minded kindness and treats him well. Just what I want to watch.
3. Supporting cast: not as strong as the other two, but we get straight man characters who amplify how strange the leads come across and support their burgeoning romance. Aharen's childhood friend isn't the most engaging or interesting character, but she works for showing Aharen's personality and a third person view of what's going on. There are a couple of other who try to match-make or determine if they're dating, which again succeeds in providing an outside view of their romance. Aharen's siblings also show up and offer a bit by way of side character flavor. For a show so centrally focused on its main two characters, I think the supporting characters work to make the most of what matters: romance and comedy. While not perfect, at least there aren't any pointless or distracting characters that steal episodes and screen time from the main couple (ahem Horimiya).
I think it's hard to find shows like this that deliver in the ways they should (1 and 2). I consistently enjoyed their goofing around antics and thought they worked really well as a romantic pairing. I hope there's another season, because this show knows how to deliver with what's actually good about this genre, rather than focusing extremely hard on giving the illusion of progress while actually forcing nothing at all to happen the entire time (the goal of a lot of slice of life romances--again, screw you Uzaki-chan).
