There's some repetitive dialogue and tutorial dialogue but let's face it...all the games have repetitive dialogue at some point. This game is the least guilty of it in the series and the best at keeping things fresh or interesting every once in a while. It's not perfect, but it's not terrible like New Leaf and it usually doesn't give boring one liners like ACNH constantly throws out which is a personal gripe of mine. It's still the best in terms of dialogue with perhaps Wild World following.
There's a few villagers who aren't mean to you upon first meeting. The normals and jocks can actually be quite friendly lol.i never played the GC version, but i can already see the complaints on this forum of villagers being too rude and ruining the immersion of the happy cute animal game if dialogue and personalities reverted back to GC style i dont care either way. being bullied might be fun.