I'm really not sure why OotP is getting so much love. I just really really hate how whiny and *****y Harry is throughout the whole book. Maybe it's because it came out at the same time as the Lord of the Rings movies and I was sick of Elijah Wood''s sad face that I just cannot get past it lol. The character that really annoys me now more than ever is Sirius. Gawd man. Get a clue. It was an unnecessary break in his character, I know he was supposed to seem reckless hence how he got killed...but he spent so much time on the run without getting caught, to me that's the exact opposite. He was also a huge knob the entire time. He just wasn't like that in any of the other books.
I really liked the flashbacks in the Voldermorts past and getting to see why he's the way he is.
Reading it now, I have to marvel at how well the entire series meshed together. It was like a seamless story from book one to book 7 with a very clear idea in where it was goine x3dg and how it had to end. Exactly what GRRM is missing in ASOIAF iMO. There are just so many clues on re reads it's really amazing.