Hate is too strong a word, but this game just didn't leave any impression on me at all. I quit around the start of Act 2 after finding Act 1 quite boring and disappointing. None of the characters were interesting or likeable, the story isn't engaging (I'm not keen on those "you're sick and have to find a cure" as the main impetus kind of plots) and the world feels fake and shallow. Larian's whole approach to map design sucks, instead of having a good variety of areas like BG1/2 that makes the world feel large and varied, they do a few bigger maps but try to cram as much shit into them as possible so you can't walk 5 meters without bumping into something.
There's another thing that bugs me, but it's more of a general trend in fantasy works than something specifically wrong with BG3 - the sheer amount of special snowflakery. Within the first few minutes of the game you're meeting devils, mindflayers, then a few hours in you meet an entire camp of tieflings (which are supposed to be rare in the setting so it should be surprise to meet just 1, let alone dozens) and all your party members are some variety of vampire or demon or some super speshul important person who's met Gods and just gets very tiresome. It's like the writers were bored by more ordinary fantasy stuff, and wanted to jump straight to the most exotic things the setting has to offer. The problem with this is when you go from 1-10 in the first few minutes of the game, there's nowhere left to go and it wears off quickly.
Compare to Baldur's Gate I and II where there's exotic stuff like mind flayers and beholders, but you need to get quite far into the second game before you'll see them. Early on your party members are much more normal, as they would be at lower levels. The designers were willing to hold off on the weird, wonderful and alien stuff until late so it feels special when you finally encounter it, instead of throwing everything from the advanced monster manual at you in the first cutscene like BG3 does.