I also like the tragic father son relationship between Angel and Connor.Epic and ambitious, complex and melodramatic. It deals with big themes such as destiny vs. self-determination, hard choices.
Oh man I am glad this thread got a bump. I voted "liked it" now I "love it."
Same as @Carrie Hopewell s4 is my third favorite season of Angel but only because s2 of AtS is a masterpiece and s1 of Angel is nostalgic and some really great stand out episodes. I think in terms of a through line, s4 does what BtVS s7 tried to do but so much better. It's hard not to compare the two. Both shows became so incredibly episodic. None of the shows were MOTW and they all were building up to a great big "thing" at the end. But AtS did such a great job of keeping everyone in character throughout the process and didn't let the big "thing" of the season ruin character arcs and developments (or if the character was OOC it was for a very purposeful reason - Cordy was not Cordy for example). When I first watched s4 I think I was a bit on the fence about it because it was basically blowing up so many things that I liked from the early seasons. It was effectively destroying Gunn/Fred, Gunn & Wesley, Connor and Angel's relationship was strained, I'm 100% on board with them blowing up Cangel but I was bummed that they were also destroying their friendship so I was a bit on the fence about it. But when I go back to watch it, I realize that all of that destruction was interesting to watch and productive. Gunn/Fred were getting boring (I enjoy them don't get me wrong but there wasn't much for them to do with them), Gunn and Wesley's dust up was interesting to watch because you care about their friendship so much it hurts to see them at odds, Connor and Angel's conflict continuing to escalate was interesting to watch EVEN if it means that Angel is put through the ringer. I could've done without the destruction of Cordelia and Angel's friendship in season 4 but if you ask me you can blame season 3 and Greenwalt for this. Season 4 was doing what it could to clean up the giant pile of crap from the Cangel romance and it does that pretty well. It basically gives you a means of retconning most of the cangel stuff in Skip's little speech. Season 4 makes "Tomorrow" tolerable because, IMO, "Tomorrow" is the greatest embarrassment in the Buffyverse. And so having Skip explain some of it helps me come to terms with the weirdness of that finale.
Mostly, I'm glad that season 4 gives me Angel back. Angel, you know - the quiet, broody, dark, edgy, sometimes slightly dorky but with a dark sense of humor, vampire we all know and love. After seeing Angel turn into a giggly doofus in s3, I appreciated having him back in s4. I could've done without the 'Cordelia births Jasmine' thing but I did appreciate Jasmine herself and that element of moral ambiguity worked well for me.
But there's only 5 seasons!.... Which makes it one of your least favourite
I am an AtS s4 apologist. I have grown to love it and find it an especially soothing balm after the ats s3 ridiculousness.