Even though these shows are a little dated (no cell phones on Buffy and mostly pagers and old phones that are infrequently used in Angel), I love them just as much as when I first started watching them back in the late 90s. They're funny and kickass and just as entertaining as ever.
However, in the spirit of the Joss Whedon fandom, I have branched out. Yes, Firefly and Serenity are on the list, but I think I'm going to finish Buffy and Angel before I get hooked on anything new.
In fact, I liked it so much, I'm thinking of watching the two seasons over again! It's just too much fun. And now, having immersed myself so deeply in the writing style, I notice connections between dialogue across shows and recurring actors. There are so many actors I see in these old episodes who were just starting out who I didn't recognize then, but know by name now (case in point: Christian Kane in Angel is now of Leverage renown). Alyson Hannigan is a household name for many because of both American Pie and How I Met Your Mother. And even the guest actors who only appear in one or two episodes have gone on to become something more since their cameos or even just appearing as extras in these shows (Aldis Hodge--also of Leverage fame--has a line and is credited in one older Buffy episode).
In any case, ubernerds, Joss Whedon fans, or those who are just Buffy fans, should take it upon themselves to catch up with both new and old shows. You really can't go wrong with any of them.
And now, I'm going to get back to watching Angel :D
Did I fall asleep?