That is honestly kind of an odd question, since it is Blizzard. I think you're asking people to compare it to private servers that call themselves "blizzlike", right? This is backwards. Look, this Classic deal is a whole new beast.
So, 10, I guess?
I just now logged off from playing the demo the first time. It's the crack of dawn in North America so all but one demo server is dead right now and I picked a dead server to avoid dealing with sharding if at all possible and to focus on other things.
Any leftover stuff from the current game aside, I agree with those that have said that the game as it stands now feels like leveling in Wrath of the Lich King. My character is a forsaken warlock, and I had him mowing down brigands and cannoneers near Ratchet without having to use Life Tap because out of combat mana regen was so good. Honestly, I don't even remember ooc mana regen for warlocks being that good in Wrath, so IMO that needs fixing.
I need to play more. Glad they're going to have the demo open for a few more days, and on off hours.
Not sure, in the end, what exactly is a serious deal-breaker for me, but phasing is toeing the line.