I can't agree with several of the falsities your have mentioned. It felt like an alpha because it was released in a not finished state and was very unpolished. A lot of people did quit because the servers were super laggy to the point where mobs would kill you and you can't even target them because of some terrible server issues. Not everyone quit because of those reasons but a decent handful of them did. Actually the combat and all that wasn't too bad and if you go and look at multiple reviews that was one of the things that kept the games score around a 5 (out of 10) and not any lower than that. At the base of it all it had a entertaining combat system to it and personally although I like the new combat better I still miss having multiple base attacks to use at will.
The people that didn't quit because of the server issues quit because everything else outside of combat was not finished and like you said some of the ideas weren't flushed all the way out. So there was no content, leveling up sucked at the time because gaining exp was totally random. Etc etc etc, the list goes on. Even as though things have changes the current engine is what keeps the game from reaching greatness.
Also in response to this: The questing system, the new UI, content finder, heavy reliance on crowd control, free companies, easy/hard modes for raids. The only exceptions I can think of are the changes to crafting and summons. First of all the questing system was around before WoW came out, it is a common MMO streamline to get added into games because it is effective and generally (though opinions differ) a more enjoyable and rewarding system. I already gave you content finder though that is a streamline feature in all the new MMOs these days as well. Free companies? What did that come from? I haven't seen that in an MMO before, especially WoW. Hard modes, I can give you that one as well though it also is yet another streamline feature, something to challenge the hard core players. So anything else besides the common streamlined features that most players expect in a new MMO? I guess I fail to see how that makes a game like WoW. I forgot to address crowd control, really? Every single RPG I have ever played has crowd control in it.