I am not a big fan of the Wes/Gunn/Fred triangle, but it is nothing ... nothing ... compared to the mess that is Angel/Connor/Evil Cordelia.
That's definitely true but there's some good drama there. Jasdelia is hands down the worst part of season 4. There's no excuses for how bad she is, from the writing to Charisma's terrible acting. I love Connor and Angel, and their relationship, so I think their dynamic is compelling. I also think Connor and Cordelia can be moving because of how sad it is to see a innocent teenager being taken advantage of by a manipulative "god". Cordelia/Angel is pretty awful though, with few redeeming aspects.
I think Cordelia/Connor/Angel actually have a purpose in the story. Connor and Angel are supposed to get all caught up in Cordelia so Jasmine can execute her plans without interference. It also does move forward Angel and Connor's characters. I think Wes/Fred/Gunn might be more pointless.