I thought Smackdown was very underwhelming for a 500th Episode.  Just didn't like a lot of stuff.  Here goes:

Good: The last segment with Edge, Vickie, Show, and Cena. That was great.  Cena, in particular, was HILARIOUS.  Great stuff.

Taker vs JBL. That was the only match that had the quality that a show like this needed.

Not gonna say "Bad" here as nothing was really all that bad, but I will say:

So So:  Just about everything else on the show.  Title change should have had more than 5 minutes while the burial of Koslov took 10. Kane and HBK had a so so match.  I see the burial of The Brian Kendrick is starting.  Match with Jeff was ok.

That is about it.  Just thought there should have been more of a PPV like atmosphere for a 500 Anniversary show.