It's closer to a 4.5 that to 5, but I give rather 5 stars than only 4. Let's round up :) 
 I have to learn to write my reviews in a word document, so that a weird hand movement on the laptop touchpad doesn't wipe out everything I wrote !! I'll come back later and write again everything that I can remember of my previous review T__T Here you go... 
 Before I started to read, I knew almost nothing about this book. No synopsis, no names, I didn't even know what "star-crossed" really meant. The only two things I knew were: 1. Predestinados comes out in Spain next month and I should write a review, and 2. Josephine Angelini has a lovely name and is a beautiful woman (gorgeous hair, by the way). 
 So, I began without prejudices or high expectations. And I was delighted by the book, its story, characters, setting and background. Once upon a time I was a big fan of Greek Mythology; with the years I became indifferent, but still enjoyed a well told story about Greek Gods. That's why I enjoyed Starcrossed, because it's a well told Greek story (I don't care if they are true to the original ones, btw). 
 For the ones comparing Starcrossed with Twilight and Percy Jackson, please stop. The only common point with Meyer's saga is the wealth, number and gorgeousness of the Delos family members, nothing more. No, Lucas Delos is not Edward Cullen; he's much better and more interesting. And I still cannot see the similarities with Percy Jackson or just because Riordan had the idea to use Greek Gods in his books nobody else can have the same idea? O.o 
 So, let's summarize everything or I could write another book about this book :P 
 Things I love: 
 - Lucas, Lucas, Lucas *_____* And Claire and Matt and Ariadne and Jason and Hector... Every character has something that makes you love them. The characters are one of the strongest points in Starcrossed. 
 - Daphne as a possible bad guy in future books. She is interesting, attractive and strong. I will love to read her development in the story. (view spoiler)[Like Helen I don't trust her, I feel she's doing everything for nobody else but herself and her persona vendetta (hide spoiler)] 
 - The love story between Lucas and Helen. Their commitment to each other, how good their relationship is described and the chemistry you can feel in your fingers while reading *!* 
 - The Greek background and the retelling of the star-crossed lovers' stories. There are a lot of creative licences, but much more originality which catches the eye and makes you want to never stop reading (even when you've already finished xD). 
 - And Nantucket. Never been there, but these islands have to be gorgeous... 
 Things I didn't love: 
 - Helen, but only because I couldn't figure her out. She's not weak nor lacks personality. I just couldn't see her as the gorgeous, beautiful girl everybody describes, as the Face. At least, not until almost the book was finished v.v 
 - The Greek names spoil a bit the surprises. I understand why they have to be named that way, but still... (view spoiler)[The moment Ariadne says Helen is the banned name in the family confirms the obvious - who she descends from - and Helen's description cried out "Aphrodite" since the first time someone mentioned she's beautiful. And Tantalus has to be the bad guy with such a name, for goddess sake... (hide spoiler)] 
 - The bad guy. Creon seemed like Darth Maul from the first episode of Star Wars, completely flat and empty as a character and ridiculous as a villain, pity! And Tantalus is like the Emperor (also a Star Wars simile :P), he's the very bad guy for sure, but you don't feel it in the book. He should inspire fear, but right now he only inspires me indifference v.v 
 - Some things don't flow right throughout the book. There are too many questions popping up in the book and because they're not picked up again in a long time, they get lost or forgotten. When you get to the point when a particular open question is picked again, you need a moment to get back on the right track breaking the rhythm abruptly. (view spoiler)[ Especially Helen's journeys to the Underworld at night, poor girl, btw!! T-T Or her aquaphobia (hide spoiler)] 
 In short, Starcrossed is a great and quite different paranormal romance. I liked it a lot, and now I'm dammed: The first book isn't out yet and I already want to read the second one *sigh* At least, I am going to buy me a hardback copy with the gorgeous cover as soon as it gets out in May... And a Spanish one for my sister too, yes, sir!!! xDDD