Err...I like to read fanfiction... :)
My favorite genres are harry potter and naruto at the moment, but I do like different crossovers. I used to be a big fan of Inuyasha and the Sesshoumaru/Kagame pairing...but I've lost interest in that genre over the years.
I wouldn't say I'm a pro for any pairing or any character particular(except for HG) in Harry Potter, but I'm not a fan of R/Hr or HP/GW. There are a million different reason's why I don't think these two couples jive together in the canon or fanfiction. For instance, since there's not much information in the canon given on Ginvera and what is said isn't flattering to her character. Also I find it strange that Harry and Ginny are cousins and they got married; third cousins in reality but still creepy! And Ronald, we'll he doesn't have many if any redeeming qualities, does he? From the experience of someone who has been married for a few years, I can't picture these people having a successful relationship together in real life or at least a lasting one, so I'm sure in the end that's what puts me off of them in general.
The only character I can really relate to in the canon is Hermione and even that only in the deadly hallows really when she grows up a bit; I'm not a big fan of her in the earlier books. Harry shows promise also, but only if he grows a backbone and utilizes his inner slytherin that's in there. For the other characters...the sky is the limit. I'll read anything that's well written and believable to a certain point.