The tracks I hate totally depend on the cars I'm driving.
In normal road cars, I can't stand tracks like Fuji 80s and Circuit de la Sarthe, as they don''t really offer any challenge. I really like tracks like Autumn Ring in these (though this is one of my most hated tracks in Prototypes/FGT).
In racing cars like JGTC, I hate very few tracks, as they are a nice middle ground, but the resrticted top speed compared to cornering highlights the bore factor in tracks like Motegi Road Course.
In Prototypes and Formula GT, I hate city tracks which are narrow like Opera Paris and Hong Kong. For the FGT my favourite tracks are smoother ones like Suzuka and Fuji, but in prototypes I love Circuit de la Sarthe, esp. II in a group C.
But the Nurburgring is always there or there abouts whatever the car, so this is the best overall, and is my outright favourite in everything except an FGT(too bumpy) and prototypes where it is pipped by le mans.
Test course is only fun in sliptream battles, but I can stand Super Speedway.
Edit: forgot about dirt/snow - all mediocre except Ice Arena which is as joke and utterly dire, and Cathedral Rocks 1 which is quite fun to race.