Short summary: Angel is a vampire. The Master hires three vamps to kill Buffy - when they fail, he gets Darla to do it. Angel kills Darla.
Analysis: Woo, this one was a doozy. After the last few clunkers, this one actually delivers. Besides the main metaphor ("This boy I met turns out to be different than I thought"), it contains a more subtle one (you can't escape your own past). Angel's past comes back to bite him and it won't be the last time (eventually, Buffy's past will come back to haunt her, too).
One of the creepiest scenes is where Darla attacks Buffy's mother. We all know Buffy can handle herself, but her mother is...well, her mother. We don't want to see anything bad happen to Joyce and just watching her in the hospital is sort of heartbreaking.
In the end, Angel kills part of his past and allows some of the future in.
Note: this episode only had a few glitches, but it's weird. I couldn't find any scratches. Perhaps it's my DVD player? But none of my other DVDs glitch on it.