I think the levelling point was good. I really didn’t understand threat, pulling or anything until after I got to 60.
Raid though, I think may be not much easier. We had add-ons, and we all knew what we were doing, but we still struggled mightily and I know my guild did not really get a kick on through MC until after DM and ZG came out.
Top guilds will blow through content, but outside them, I think guilds will have the same limitations we had in vanilla. It is tough to find 40 above average players that can commit to raiding, on the same time slots, and fill a roster composition that is ideal.
You then face losing a steady stream of people to more advanced guilds as they fill in their attrition, and lure people away. So you are constantly looking for people and trying to get them gear and experience so you can keep raiding.
So, you end up raiding with people who are under-geared, less than perfect spec, less than perfect class, less than perfect ability, and who don’t necessarily know your strategy and are not used to working in your team. At that point raiding becomes harder.