I always say Shadow T2c and get called a fool in GLFF, glad to see all the smart people are here in the forums! This fight had absolutely every element that can be found in lotro, without a hard requirement to do it in a particular way, or class makeup (beyond the general need for ranged dps). I will admit the fight lost a bit of luster when everyone was decked out in 1st agers and perfect builds though.
My other top choices are OD fear and the Lieutenant in BG.
On a personal nostalgia level Lightning wing in ToO always brings a smile to my face. There was a good 2 week period on Nimrodel (from when our kin got server first for T2c) where no one knew that if everyone was at max melee range the static buildup on the tank could release without hitting the group, and for that brief period I was the only one who could time running out of range of the group, blow up, and get back in time to prevent the boss from moving and forcing everyone to stand on the electric floor early.
[center]Let our actions speak for themselves. Jinjaah has been pouring over every post in the Bullroarer forum. Please keep in mind that any experiences with previous LOTRO teams are not reflective of the current team, give us a chance[/center]