Very cool to see the cast reunited. I felt this show had great moments, but conceptually, wasn't as strong as Buffy. It felt like a spin-off with references to Buffy, often, an re-treading on some of their themes and characterizations.
Cordelia grew tremendously, Fred was a delight, Quinn's character made an impact on just nine episodes. But, I always felt like they didn't let things stew long enough. They seemed to be forcing growth and over planning a season, instead of seeing how these elements meshed together. So, there were missed opportunities, seeing what resonates and works, as opposed to forcing the story out without the actors, or development, to do so. It just didn't feel organic, when they tried something new.
The second is my favorite. I think Darla and Fred are great additions to the show, and so is the backstory to their hotel. The fourth had the best concept, and the fifth just felt forced. Angel is a sellout. He's a puppet. He made a deal with the devil.
I much preferred the intimate stories to the epic, on this show, and it would provide a nice counter-weight to Buffy's "end the world every May" stories.