Abandon Shipping: Although many fans liked Robbie with Georgia, him choosing to leave her in favor of going to New Zealand certainly put a bit of a damper on things.
Broken Base: Many think that the series started out pretty well, but the last two books (the last in particular) have been criticized by many fans saying the series has become an Overly Long Gag and lost its magic.
Crazy Awesome: Pretty much everyone, although a special mention goes to Rosie and of course Georgia herself.
Pretty much anyone who is demonized by Georgia for whatever reason. And they are really a lot of people.
Die for Our Ship: Robbie is still pretty well liked despite the fact that most of the fandom ships Georgia/Dave. Masimo on the other hand...
Draco in Leather Pants: Georgia is loved by fans despite being immature, insensitive and often deliberately cruel.
Ear Worm: From the movie, Ultraviolet shows no mercy.
Ensemble Dark Horse: Dave is the most obvious one, but both Rosie and Sven are very popular as well, and many fans were disappointed by the lack of Sven in the movie.
Robbie, to an extent. Even though most of the fandom ships Georgia/Dave, he's still rather sweet and kind and most fans like him.
Fan Fic Fuel: The ending of the last book, although technically wrapping up the debate of who Georgia would end up with, was rather short, sudden, and with weird phrases such as Dave's "It'll probably all end in tears. Mine.", which was a rather depressing start to the relationship that had most fans rejoicing. Consequently, some have taken it upon themselves to write stories based directly after this conversation in order to prolong the getting together of Georgia and Dave.