So far in Northrend, I've managed to ding 72, compete a good amount of quests, get to Dalaran, and complete the first five 5-man dungeons. For those at home who haven't been keeping track, or haven't looked it up yet, here's what those are:
Utgarde Keep (70-72)
The Nexus (71-73)
Ahn'kahet (The Old Kingdom) (74-76)
Drak'Tharon Keep (74-76)
As you can see from the recommended level, I was a bit under on most of the instances. My gear was fine for it, it's really more the fact that because of the level difference (5 levels in some cases), I kept missing all over the place. I think at one point, my DPS was around 200. (Not exactly stellar for a mage of my level.)
I didn't take pictures; didn't want to spoil anything for anyone, but I was very impressed with the instances. The thing that I noticed the most is that they're short. Granted the group I was in for the upper dungeons were all higher level than me, but they hadn't really gotten very many gear upgrades. And the stuff that was dropping at that point was about on par with what they had. So, while a lesser gear grouped might take a little longer, it's still pretty feasible. I think we were joking that Azjol-Nerub is the Mt Hyjal 5-man of Nothrend. (One of those scripted pulls where things keep coming until you pull or kill the boss.)
So, by my count. That's almost 1/2 the 5-mans in Northrend. I'll wait a bit before doing The Violet Hold (75-77), and then maybe I can actually be a contributing member of the raid. lol. But overall, I'm having fun. And I don't even think I'll mind having to run these instances again and again for rep. Then again... we've only just begun, haven't we?