Whether its your guilty pleasure or not, sometimes we all have that genre that no matter what, you will try it, and play it. Even if the game looks terrible you will still put the effort into playing it a few times.

For me. its Music/rhythm games. DDR, Frequency, Guitar Hero, Gitaroo Man, PaRappa the Rapper, or even Mad Maestro. If its a game about playing pushing buttons or synching to music, I will play it. Its probably my favorite casual genre.

Fighting games are my second choice though I don't actively seek it out as passionately as I do Rhythm games but I love fighting games and can be easily talked into playing any of them even titles I don't care for like Tekken, DoA, or Smash Bros. I will play them.