Uh, because he's pretty, funny, and- bonus- Canadian! (Sorry, can't help loving it when I see my countrymen succeed) He's also not a bad actor, pulls off a variety of roles fairly well. That's why I like him anyway, though I can't say I think about it a whole lot and I've never gone to see a movie JUST because he was in it.
I'm not obsessed with Ryan Gosling. I like Chris Hemsworth,CHanning Tatum and Ed Westwick. lol . But in my opinion,Ryan is a nice-looking guy. His face is not that special,but it's not ugly.And probably from "Crazy,stupid love" every girl thinks he is such a hottie(because of the abs),a womanizer and a gentleman at the same time. My opinion.