I'm a huge fan of Harry Potter. I started reading mostly because they were written by and English author (and anything English I'm a big fan of - except Marmite

).
I read them for pure entertainment. I enjor reading, but it's hard for me to find a good book that I can't put down. I've read some excellent books, but none that have been able to capture my attention like Harry Potter.
I think those who are fan of Harry can atest(sp?) to the fact the J.K Rowling can really capture emotions. I can be angry, frustrated, sad, and happy, with all of her characters. For me, a well written book is one where I can empathize, sympathize, and/or relate to the characters, and I certainly can.
I'm probably not doing a very good job of explaining my like for Harry Potter, but for me it's kind of hard to describe. I just find the books exciting.
I guess they're not for everyone. Not everyone has the same likes and dislikes.
I'm just glad that you took the time to read 2 of them, so you can honestly say you're not a fan. I always say, don't knock it till ya try it. And you have.
I doubt I answered all your questions. I don't know if there is anything you should really be on the look out for. I'm sure there will be many more answers to come.