I like that most of the games I buy for PC cost $5-$20, even though they're less than a year old.
I like that games released with serious issues are often fixable with some settings tweaks, and it's easier for developers to release patches.
I like that community mods often add tremendous value to games, making them better, or at least different, experiences.
I like that I can play virtually any multi-platform with an Xbox controller on my PC, and it requires zero setup.
I like that my SSD means extremely short load times.
I like that online games often perform better thanks to dedicated servers and no overhead or limitations from a Microsoft/Sony online service.
I like that I can play GameCube, Wii, and PS2 games--with an Xbox or PS3 controller--rendered at four times their native resolutions, and that some of them are stunningly gorgeous in HD.

PC gaming is pretty cool!