I felt the same the first time I tried it. Gave up after two episodes.
But when I went back to it I got sucked in because the writing was so good and it was kind-of rewarding to hate them all.
Thats the whole point of succession, to hate all the main characters as they are all such utterly vile human beings.
The scriptwriting is utter genius though, particularly the casually tossed sweary insults. Once you realise that the writers are the same people who wrote Peep Show it all makes even more sense.
I actually fancy going back and watching them all again