Virtua Fighter is my favourite fighting game series, I could even say it's my favourite video game series overall.
I play fighting games a lot and attend regular tournaments to play both VF and King of Fighters XIII. Most recently I even placed top 4 at the Australian nationals for VF5:FS
If you skip to about 30 minutes (I think, can't check at work) in on this archive you can see the top 6 finals for the game:
http://www.twitch.tv/ozhadou/b/370634433As you guys have said, I really do find it a 'pure' fighting game experience. If you look at how other series have evolved, Virtua Fighter is a stark contrast. While most series have been adding more and more features into their games (sometimes to good effect, sometimes being a detriment) VF is still just two characters and their health bars. There aren't any comeback mechanics like Marvel's X Factor, or Street Fighter's Ultras. I really applaud VF for keeping this style, as it's really what the fans want. In fact even players of other fighters appreciate VF for this fact.
And while I agree the game is really easy to get into, the best thing about it is that it's so, so deep at higher levels, and that makes it so rewarding to play.
Learning how and when to use evades, guards, half and full circulars, mids, how to throw-break correctly etc. It makes the game so much more rewarding because you sink so much time into just one character and still find more to utilise in their game.
There's more i want to go into, but i'll leave it at that for now.