I liked all of them but my favorites would be 3 and 4. I liked the fact that they thought some dangerous person was after harry in the 3 one and i liked the 4th one cause it had a lot more details in it and new events
I loved 3 because it was such a difference from the other two the charchters evoved really well and the story was just plain better. I also liked 4 becauseit has such A TWIST ENDING in it. The only compaint I would have about 4 is that it servd as more as a filler than a story in it's own right.
I love number three because I think that it is great how Sirius Black comes into the story and that Harry actually has someone to talk to besides his friends. Sirius also knew his parents and that was cool. I thought that number 5 was great but it was a really depressing book. I was really mad at the end but I can't wait to see what happens. I liked all of them but these are my favorites.
And Liz...I liked #3 b/c we got to meet Sirius and it gave Harry family again (even the beginning when you thought Sirius was bad). And Lupid was the Defense Against the Dark Arts teacher...the best one. They won the Quidditch cup...and you actually got to see Harry happy (at the end with Sirius' invitation).
i didnt expect #3 to be most popular. i agree that #5 was depressing but #3 just wasnt that exciting. i did like it cause of sirius. he rocks! i didnt really like #1, it was dull and boring. i think that with most authors their work gets better as they keep writing. #4 was also one of my favs. #2 was great too. i love em all!