I own the game and love it. But then again I'm a huge fan of Dead or Alive and Ninja Gaiden so I may be a little biased in that opinion. I think Team Ninja is one of the best developers out there. While I find the girls attractive, simply their looks would never persuade me to buy a $60 game, I genuinely enjoy the gameplay (especially the Wave Race wannabe game). I think the RRXX girls look sexy but the game is stupid so I refuse to buy it. If I really wanted to play a perverted secks (the real word is censored on these boards for some messed up reason) game there are plenty I can find online for free.
Of course the gameplay is simple, why is this a bad thing? Mario's gameplay is simple yet the games sell millions, does that mean it sells because we all find Mario sexy? Every FPS is point and shoot, how is that considered deeper gameplay than DoAX2? Look at all of the classic arcade games in the past, all VERY simple gameplay but were tons of fun. Gimme a fun game with an interesting setting and interesting characters and I'm set. Not everyone will find the game fun though, millions think GTA3 is fun and I think it's the most boring and repetitive pile of trash to ever grace a console. As for the music in DoAX2 it's complete and utter trash, but that's fine because we got custom soundtracks. I'll be blasting NIN or Cannibal Corpse anyway, everyone else can listen to the Bahamen or Hilary Duff if they want. Chances are if you dislike DoAX2 it's simply not your style of gameplay or you do not like the settings and characters. It's not because the gameplay sucks or because the game was halfassed.
I wouldn't call everyone who buys DoAX2 a pervert or loser without a girlfriend though. That's like saying everyone who plays GTA is a thug or drug dealer.