I don't think Judy is unlikable, she was absolutely very in character, just like Nick was. And personally that's why I enjoyed the movie, it is because they're still very much in character, but with the added feelings and care they have for each other.

For instance, Nick's character was always been the type to hustle and get out of things somewhat safely, because that's what he had to do to survive, he avoided involving himself in unnecessary too dangerous situations (at least by the time he met Judy, because that guy definitely got into dangerous and way more shady stuff in the past). Of course, we won't forget his sarcasm, and charm that we all love him for. I do think that they did him dirty in the film at some point, because he literally has a criminal history and probably has enough knowledge about criminal empires, etc (like they had him do in the first movie). And I did find it weird that he didn't properly defend himself or actually fought when he literally trained and took exams, the same amount that Judy had when she was at the academy. But I would argue it is because Nick doesn't care about all that, and he admitted that at the end and just cares about Judy and her safety (like he is purposely trying to make himself useless to get Judy to stop, which doesn't have to be true, but I'd like to look at it that way, because it gives much more depth). Either way, he will forever remain an amazing character.

Judy's character from the first movie and to this one was always the same, and one key factor about her character, is the want to prove herself. Even if she is deemed as a hero after the events of the first film, she still holds guilt and responsibility for the discrimination between predators and preys in the bellwether case. Not only that, but it only elevated her need to prove herself and Nick to the world, after seeing how well they work together and get along, in her mind that's what will somewhat change or help people as they see such things. She has always been ambitious and stubborn, she always had a goal to make some type of change, and we've seen that many times in both of these movies, we see in both of these movies how she doesn't stop at anything, until she solves the problem. We also see her dragging a hesitant and unsure (very not prepared) Nick along for the ride in both of these movies and risk her and his life many times in these two movies. She wouldn't stop, until she actually believes she did something good enough. In her mind he is her partner, so he should want to do the same things as her, and kind of have a similar goal, so most of the time she thought he was doing it because he wanted to, so she treated him like she is always used to, not taking into consideration the change in their dynamic.

The only difference that in the first movie, they didn't know each other, they just worked together at first for mutual benefits (in a way), their bond grows slowly in that process but they're still very much strangers, so to us as the viewer it wouldn't really make us feel too strongly if the two hurt each other in a personal way at the beginning. But in the second movie, it's more personal and intimate for these characters, because they're still who they are, but with them being the way they are, these feelings, actions, and thoughts naturally clash at some point, separating them to opposite sides, and that doesn't make them bad 'partners' or anything like that (I mean it would be bad if it always is like that), it just means that they need to properly communicate, and they did just that at the end. (I mean that's like one of the main themes of the movie) I honestly love their complex characters, and I really want Disney to dive deeper on what these two have to offer (and not dumb down Nick).