Was one of my favorite shows, back in the day.  Suffers by comparison to modern shows, as there are so many well-written TV shows airing now, but at the time, it was a rare treat to have a show that didn't pander to the lowest common denominator.
Some of the episodes are absolute classics (Hush, for one...), others are more run-of-the-mill.  I think I stopped watching when it got really dark and depressing, around Season Five (?).  Angel is also one of my favorite series, especially the final season, truly a series that ended on a high note!