"The Nerd celebrates 20 years of Angry Video Game Nerd in AVGN episode 215, with the series that started it all and this time he's going to decide what the greatest Castlevania game of all time is for good!"
It's an interesting video, but just to be clear, he's talking about what he thinks is "the greatest Castlevania game of all time" ...while not even mentioning any game post-Symphony of the Night at all, aside from Castlevania Chronicles (which was a remake of a much older game), and no game beyond the original Playstation era. So, take it with a grain of salt.
However, even with that said, even taking all the newer games into account, I personally find it difficult to argue with his pick of Castlevania 4 (aka Super Castlevania) for the SNES as being the best of all time. I love
(EDIT) Oh, and I was reminded by some of the comments under the video that the Castlevania: Nocturne series came out last year. I'd completely forgotten about that. Guess I need to get on that. (/EDIT)