I'm running Keep on the Shadowfell for the third time, for a third group. Fortunately, this time around I can take all the changes implemented from the second time (ie, the whole adventure) and better integrate them. It also helps that 75% of the party isn't fucking drow, possibly due to the fact that I restricted the players to using Essentials (with a few exceptions). I did this partially because I wanted to see how it would work out in extended play, side by side with other content, but mostly because two of the three players are completely new to the game and I didn't want to overwhelm them with hundreds of choices. If you've played Keep on the Shadowfell, there're a lot of changes, so don't be surprised.
Not surprisingly, everything played just like 4th Edition, except for class resources. The players controlling the knight and thief only had to worry about one encounter exploit, routingly making basic melee attacks each round, modified only by the stance or trick used. This kind of fucked Delinth, who spent the first round of combat "prepping" his aura and stance. Were he a fighter he could have moved and then charged a kobold, dealing some damage and auto-marking the target, but I'm sure thats part of the inherent balance.