Honestly it would have been so much better for the show. To start with no breaking up the fang gang for a year with Wesley going off. Wesley could still have become a badass in other ways, or hell his betrayal could have been less stupid. Maybe he killed several people at Wolfram and Hart when they did something to Fred, rather than stealing a baby from his friend and thinking Holtz of all people could be trusted over Fred and Gunn or The Host?
I like the idea of Wesley going rogue because of the actions of Wolfram & Hart. This would make a lot more sense. And since we know there was clear chemistry between Stephanie and Alexis (in hindsight), there could have been developments on the Lilah/Wesley dynamic, where they go toe-to-toe before the weird angsty relationship that occurred in seasons 3/4. I enjoyed Dark Wesley, but the catalyst of that--him betraying Angel because of the prophecy of Angel killing Connor, just didn't make sense.
Darla could have stuck around for a bit longer as a femme fatale which might have been cool.
Yes, having Darla around definitely elevated the show. She adds a layer of intrigue and wicked fun whenever she's around (on Angel). I think it also would play into those hanging threads from season 2, as I stated previously. I don't think there was really enough follow-through on the fact that
Angel betrayed
Wesley, Cordelia and Gunn in season 2 when he fired them. Cordelia spent one episode mad at him in season 2, and then they quickly returned to their normal dynamic. In season 3 proper, we got an annoyed Cordelia about the sex, but we didn't get to the underlying issues.
I think it's often overlooked that Whedon did a better job of developing the characters and story of
Buffy than he did
Angel. Even when Wesley betrayed Angel towards the end of season 3, there was no cross talk about Angel doing literally that to him a year prior. And that betrayal and the ramifications of it actually carried over into season 4. But the main character being the betrayer in season 2 was just pushed under the rug.
This would have been much more interesting to see play out. Darla coming back to stir up the pot, but also having Angel and Darla reteam out of necessity to take down Holtz, and maybe having Cordelia, Wesley and Gunn have some reservations about going against Holtz because he is actually doing the work of going after evil vampires (i.e. Darla), and having Holtz team with Gunn's gang, playing to the dynamics that Gunn was struggling with at the beginning of the season in
That Old Gang of Mine would have been much more compelling than the baby prophecy storyline.
What is enjoyable about Angel is that it's a much more gritty show, and had the opportunity to explore more adult themes than Buffy did, because it's
not a coming-of-age show. It's a show about adults making difficult decisions, and exploring the ramifications of those decisions. With a demonic backdrop.
I guess if they'd wanted they could have explored Angel being a father in flashbacks, maybe show how he'd raised that baby that Darla wanted him to kill that he ran off with (what happened to that infant anyway?)
This idea had already been explored with the Angelus/Penn story from season 1. Though, it might have been interesting to see. I do like the Angelus/Darla vs Holtz flashbacks, and I do think that the Holtz storyline elevated the show during the middle of season 3. The problem was the stealing of Connor and coming back as a comical older version of himself, and Connor coming back as a weird angsty kid. Having the son turn on the father was kind of interesting(?) but it wasn't well executed.