Bangel got boring? It was the most thrilling relationship of the whole verse, it was full of surprises. For once, you didn't think Buffy would send an reensouled Angel to hell, but, she did. You expected that newly-returned-back-from-hell Angel would blame Buffy or worse, hurt her and the others, but, he didn't. While you are thinking they are meant for each other, live and love happily ever after, Angel leaves Buffy. Then, at a time least expected, Angel returns to help her with being seen to anyone but her, she learns it and goes to him, Angel becomes human, they make love, are happy, then Angel returns back the 'gift' and bargains that the memories of the day would be forgotten by Buffy. Then, he again visits her, gives her a hand, stays the whole night with her, consoles her. And at the end, he comes for the last time, gives her a kiss, proudly watches her as she kicks a--.
Cangel is on the other hand is a cliche, I did expect that there would be a love relation between them and prayed that it wouldn't. For once, it would be boring; a secretary falling in love with her boss? So what? Cordelia is boring when she falls in love with the 'hero', she is perfect with sidekicks ; Doyle, Xander, Wesley (BTVS Wesley). The most interesting part was when she slept with Angel's son. It was really exciting. Something was wrong but it wasn't because Connor was not handsome or caring or plain evil, but, yes, Cordelia was evil, otherwise she wouldn't have slept with Connor, would she? Oopps, did I say Cordy was evil, no no, she wasn't Cordelia, no, she was Cordelia but she wasn't herself, Cordy is never evil, she can be quite bitc-- sometimes but other than that... Tell you what, Cordelia in season 4 was bitc-- not evil. And sleeping with Connor? What would she do; sleep with Angel and make Angel lose his soul? If that happened, I would believe that she was evil. Other than that, I don't buy it. Season 4 was full of story holes.