I don't understand why most of the people compare "Dead or Alive" to "Virtua Fighter" so much. I have played both series since forever and both have a different feel to it.
"Virtua Fighter" is the nr:1 deepest, realistic fighting simulator game out there while "Dead or Alive" is fast, arcade fun kind of a game that takes advantage to the environment and look's good while playing it.
Is "Dead or Alive" as deep as "Virtua Fighter"? God No! But it doesn't need to, they are quit the opposite. Even the creators of these games doesn't deny this. Yu Suzuki's direction to "VF" is to have total realism while "DoA" creator Tomonobu Itagaki is simplicity. Both have mention this on interviews.
I for myself are glad that "Dead or Alive" exists and I think we need a game series that stands out like the way it does, it's pure fun and simple but still a fast aggressive fighting game with obvious controls and function. And comparing "VF" to DoA" for me is complete bullocks. Both of them are the best on their crafts and who says you can only choose one of them.
"Dead or Alive 4" is the recent game of the series and it's the best one so far with more moves, more character's, fantastic interactive stages, faster game play and a final boss that will be a great challenge for the experienced "Doa" players but a tearing experience for the newbies. I Should also mention that it has the best ending sequence a fighting game has ever had, seriously!