Here is why Classic has been so great
There’s always tangible progression. Everything is a threat from 1-60, but you start to get more and more tools, your character grows. The amount of immersion in this game is insane. The feeling of being a fucking nobody trying to survive and get powerful. When you’re the zero wanting to be the hero everything is challenging. Being the hero means you know you’ll win.
The flow of the game. The game from the ground up is designed to encourage players to group up and help each other. To share knowledge and resources and to help those who are behind to catch up.
Classic is harder, unforgiving and can be frustrating, but once you achieve your goal it feels great. That sense of accomplishment is addicting. Leveling takes time. Progress takes time. Means you put more time and get stuff from hard work. Leveling actually feels like a challenging experience instead of a boring rush to max level.
It's an mmo plus rpg again, a plus 1 stat means something, you notice the difference, you feel the difference. The classes have their own unique pros & cons, separating them from each other. Professions actually mean something now as gold is extremely hard to come by.
It has been an awesome experience so far, the world is bustling and active. The players have been great. I had high expectations and it has exceeded them.
EDIT:
You have Retail players saying Retail is better, they are right. It's right for them.
You have Classic players saying Classic is better, they are right. It is best for them.
Really that is all it is. The only difference is im not in retail forums yelling classic is better. You have your team and in most cases I do not trust teams of any sorts. Enjoy your retail, I will not hate on it and won't come over there to deliberately hate on it. Maybe everyone involved can do the same. I love Classic, you hate it...big fucking deal. How about we just quit being douchebags about it?