Before I state why I'm quitting the game, let me just say that I know I am going to be subject to negative comments and I know very few people will agree with my points, but here are my reasons why I've decided to just stop.
1. PVP is getting worse. I am well aware that PVP in this game was never ever balanced, but it was the most balanced in Burning Crusade. World PVP has also nearly died due to subscription loss which I will get to. The amount of stuns in PVP is just horrible and you're constantly praying that Blizzard doesn't screw your class over. My neighbor loved PVPing and did it very religiously, but now he as well as many other people can't stand it.
2. PVE has also gotten worse. Nowadays, it's freakin' mandatory to gear up via LFR and put up with idiots who aren't willing to follow mechanics and leave you with a huge repair bill. Not to mention dailies are being shoved down our throats and it takes way too long to gear up for raids.
3. WoW seems to be steering away from being casual friendly as much as possible. You'd have to be a no life player in order to gear up fast and get into Normal or even Flex. People who have to work for a living nowadays can't even gear up fast enough to catch up, and this game has basically become a rat race which almost nobody has time for anymore.
4. Now for the big one, the community. Oh my god, I ****ing hate how toxic this game has gotten overtime. I'm honestly surprised that there are people still subscribed with this game now becoming nothing more than "World of Griefing". This community has even pushed me to high anger levels that it almost makes my blood pressure as high as my father's and has especially turned me into the very type of person that I hate overtime.
So in conclusion, I have wanted to hold my interest in WoW and have wanted to stay in the game, but I have simply had enough of of the state of PVP, the state of PVE, the pointless rat race, and the community. I've wasted my money and my time on this game, but at least I know better now than never. Those that disagree with me and still love WoW, more power to ya.
EDIT: Of course... there's always Molten WoW. :P