Series? Or Stand-alone books?

It really depends. I read both. However, I do have a condition for reading series. I hate to read series until they are all published. I don't want to get into a story, like really into it, and then have to wait 1-2 years for the next chapter. Makes me angry. Of course, this past couple of months I started Melissa de la Cruz's Blue Bloods series. And of course not all of the books have been published. Argh!! Why did I start this series? I'm really kicking myself now, but I'm invested in the story. Thankfully I just got Misguided Angel from the library (had to get it from holds) and the side book, Bloody Valentine. Unfortunately the next book won't be published until later this year. I don't know if I can wait!!! But if I actually follow my rules, I do like to read series.