I actually always read every spoiler I can find. Because then I know the show is going somewhere! Like when I was watching Lost in the same time it was aired, I got more and more the feeling the story was going nowhere. So I stopped watching because it was a waste of time. Then when the show ended, I read lots of reviews, spoiler and understood "Oh, they really were going somewhere with that" and now I want to watch the show again.
Spoilers also made me want to watch Angel! When I read things about Angel in here, I thought "Oh, this is going to happen in that season? Oh and THAT happens in that season? Jeez, this season seems awesome!". Before that I just thought "Well Angel is basically like Buffy but in a lame version right? I mean Angel is lame so how can his show be good?" but the spoilers changed my mind.
I already had bad surprises with spoilers tough. During a very, very dark time of my life, when I was, haem, a Twilight-fan *Yeah, I know, ew.*, I couldn't wait for the 4th book to come out in French so I read spoilers and I thought "Nah, that's impossible. Nah, that's not gonna happen. I mean come on. Is that Twilight or some cheap fanfiction? Oh and Bella will...No joke! That can't happen. No way."
Then when I read the book, I realized the spoilers were true, that was very disappointing (it was the begin of the fall of my addiction).
But really, most of the time, I love spoilers. I'm currently rewatching Pretty Little Liars and the suspens was unbearable the first time. So I read spoilers on the net and thougt "Ooooh, I see! It doesn't make any sense and it's a crazy plot, but at least I know who is -A, hahahahaha". It's called dramatic irony, you know something that the character don't and you wait for the revelation *so says my teacher*
So...Yay spoilers!