I am! Admittedly, I'm not great at fighting games by any means, but I like them nevertheless. I have the problem of being too good to find challenge from my friends who don't play, but nowhere near good enough to beat my friends who do. Granted, they've always been better.
Anyway, I have a long history with fighting games. The first fighting game I ever played was Mortal Kombat on the SNES. Yeah... The first I ever actually got good at was Killer Instinct. For years, Soul Edge/Blade was my game of choice, though I lost interest in that series after Namco started resorting to gimmicks circa SoulCalibur II. During the life of the Dreamcast (amazing system for fighting games), I took a great interest in SNK's catalog. I actually prefer King of Fighters to Street Fighter as most characters have larger and more varied move-sets. I think KoF98 is probably best overall, though I also really like 2001. Last Blade 2 and Real Bout Special are other favorites of mine.
In recent years, I think Virtua Fighter 5, Super Street Fighter IV, and BlazBlue have been great, though BlazBlue has a near vertical learning curve for fighting newbies. Also, I love the 2011 Mortal Kombat. I didn't expect it to be nearly as good as it was.