I think most of us agree that slow chicanes are awful. Because it’s difficult for F1 cars to manouver through it, but most of all because it prevents overtaking.
Agree with the Barcelona chicane. What adds to the misery is that it is created to increase overtaking on the straight (besides safety reasons). But it turned out that it made overtaking even worse. Because the chicane is so slow, the car in front just accelerates away from you.
Same goes for the chicane and consecutive hairpin in the first sector of Abu Dhabi: way too slow, which makes overtaking on the straight too difficult.