It's a big one.
With the arrival of the Black Temple, there are rumblings in our guild about not being able to, eventually, take part in it.
Its a valid complaint, starting with Blackwing Lair, Blizzard has released content at a pace only the most progressed PvE guilds manage to experience it all.
If you are trying to get through MC, by the time you made it to BWL, AQ40 was out. And if you were trying to make it through BWL, Naxxramas was out. And then BC comes and hardly anyone does those any more - for good reason.
So unless you hit existing content hard and fast you are left with instances undone and unseen, because no one wants to spend anytime on things that are old news.
Getting back into D&D
2 hours ago