This just in: Mirkwood is a lot of fun.
Maybe it's simply a relief to have a normal outdoor questing zone after spending a year in Moria and Lothlorian. Moria was an amazingly well realized dungeon environment, but it was also oppressive and at times stressful to level in. Lothlorian had to be the most anti-climatic final zone I have ever seen in an MMO. You spend weeks struggling through challenges of epic proportions, only to be told that you need to spend a few evenings cleaning up orc filth before you can be trusted to even set foot in Lothlorian. Once in Lothlorian proper, exciting tasks like picking grapes and meditating await. The 1-60 game ended on more of a whimper than a bang for anyone that wasn't a raider.
Mirkwood addresses this issue pretty well. Now, after spending some time recovering from Moria in Lothlorian, you have a new final high level zone to move on to. The quest chains you need to get through to enter Mirkwood are combat heavy and fairly challenging. You'll want to get into a PuG for them if at all possible. There is also a steady stream of NPC elves coming along to help you fight in most spots. This simple device makes you feel like you really are part of an invasion force, rather than some lone chump that does all the work while NPCs laze about in camp and come up with new missions for you. So far, Mirkwood is a much more satisfying cap to LoTRO than Lothlorian was.