And that means seeing more than just the most recent raid. This was, in my opinion, one of the top ten gigantic screw-ups of the Lich King expansion. This model of "players seeing content" was poorly implemented, resulting in the opposite, with any new players being catapulted over older content and right into the latest raid. Maybe players missing Naxxramas 2.0 wasn't much of a loss, but missing Ulduar and a couple one-off dragon fights, particularly the one where we kill the Aspect of Magic, seems like a bigger problem. That wasn't entirely new. Ever since BC came out, older raid content has been leapfrogged entirely. Maybe there wasn't a good solution to that, so let's say it's not actually a problem. In fact, let's say that the new rolling raid model is shiny and leave it alone.
How would you like to gain 10% experience? No no, this isn't a new piece of heirloom gear. Instead, it's the complete opposite. Stick around in Azeroth at 60 or Outland at 70, maybe Northrend at 80, though I've not tried that yet. Watch your experience. Notice how you can go from 1200 per kill to... 120. 120? Huh? I know mob xp drops a little when you level, but a 90% drop seems a little bit extreme. That's just Blizzard telling you to get the fuck out. It doesn't matter if you're trying to finish a quest chain, get out, now. Go to the next expansion. And don't you dare hang around there either!
Maybe I'm reading it wrong. Maybe they're actually trying to be nice. Maybe they're saying "please, go ahead and finish up, we'll give you some experience for it, but we don't want to push you up so high that you can't enjoy the next zone." The mess of a leveling curve suggests that they do not have "let players finish content" as their goal.
This makes no sense to me. Why would you try to push players out of content, particularly content which the player has not finished?