I played the game for an even longer amount of time than you and essentially came to the same conclusion. Don't believe anyone saying because you played something for a "long time" you secretly loved it.
It's a weird, disingenuous defensive maneuver usually utilized by hurt fans.
If you are like me;
I played it for the first two chapters - did all the side missions possible - got bored of the landscape
Got to chap 3 - spend 30 hours or so doing every side mission possible
Whacked the story up to chap 8 in about 2 hours
Did the remaining side missions
Completed the rest of the story
Lol one or two trophies left for platinum - why not?
Did I hate it? no.
Did I enjoy it? At times - yes alot to begin with
Did I get bored of it? Yes, by the end it was just a chore, waiting for it to end
Would I play it again? No