The best of Angel (season 5 in particular) is the very best Buffy as an IP has to offer, even a bit better than the famous parent show it spun-off from. The WORST of Angel (a majority of the episodes involving that dweeb Connor
) is borderline unwatchable corny trash. I'm assuming you'd only ask this if you're already familiar with and are interested in Buffy. In which case yes, even if it has some embarrassing lows, the highs and the development of the cast/universe overall are 100% worth checking out. If you actually haven't watched Buffy first you really should get on that before Angel tho