My review of the book...
Loved the Tom Riddle bits the best. I'm slightly bias because I do like the character and I was totally thrilled to learn quite a section of the book was devoted to him. It was great fleshing out the man behind the name.
I didn't like the romance. Sometimes I got fustrated and got irritated with Harry, he should be deciphering these memories not chasing Ginny! He seemed to leave all the work to Dumbledore, and now Big D is dead, what's Harry going to do? Probably go crying to Hermione like he always does. Well, I like Harry but sometimes he just annoys me. Oddly enough he actually amused me when he chucked temper tantrums in Book 5. I was like "Woah. Totally unexpected, he was always such a nice, quiet boy...wtf?" and then I just enjoyed those moments.
I suppose the romance was required. Kinda like a necessary evil. They are teens after all, and I suppose we gotta give poor old Harry some sort of romance before he faces probable death by Voldemort in the next book.
About Snape. I think he is good. I have a strong feeling he is, I just don't believe he's gone bad. For me, it's a matter of faith in the character. Not actual digging around for proof. I'll be disappointed if he has gone bad though, the Snape character will be just BLEH if that happens, all that lead up...for what? To die, or spend the rest of his life as a fugitive or hanging around in Azkaban.