I guess my question would be, why do you hate the characters?
1. Do you hate their character arcs, because they actually do have one?
2. Do you hate them just because they were in shows that you hate?
3. Or do you just hate them because you have issues with their existence at all?
I'm not asking you to justify your opinion, I'm just legit curious.
added numbers to help clarify answers. a lot of us that are a bit bummed about these characters tend to come from the same places.
First and foremost, a lot of us mostly just don't want to see them in mandalorian, because LIKED mandalorian without them, it's a change, that seems unnecessary, and they are characters from shows that had completely different tones from mandalroian; so there's great concern that to make the cartoon characters seem "right", they will have to change the tone of the mandalorian.
1. a lot of the frustration for me, comes from the long running serial nature of the cartoons. they are meant to be watchable by young kids, so long term serious consequences are few and far between, there are a lot of "kids show" plots, etc. also, everything needs to be back to "normal" after 1-2 episodes, so they can tell the next little story. This has a tendency to simplify the characters, and to make it where they are accomplishing ludicrous feats in 15 minutes. it makes them very mary-sueish, just so they can get through an episode.
2. see my first point, we didn't care for the shows, and these characters showing up signals a higher chance of mandalorian being LIKE those shows. so we'd rather the characters just not show up.
3. the character's existence is fine, they functioned within the logic of the shows they were created for. we just don't want those characters bringing stuff from those shows over with them.