We completed the season last night and much of the fight turned into a bottleneck, just as I thought it would. This map created a bottleneck THE FIRST time it was used earlier in the season - only then the start area was in another location.
I ruled that the wall by the stairs was more of a bannister/half wall that could be climbed but they were still stuck there for most of the fight.
This entire season was a disappointment because it seemed so many sessions were poorly thought out or the maps did not match the description, or the starting location did not make sense.
The session where the entire encounter was a skill session did not go over well at our location - a couple tables completed it within 15 minutes.
The variety of monsters....well, there WAS no variety for most of the sessions - it was drow, drow and more drow (with spiders of course).
The author was not to be found on the board for the entire season to offer suggestions or clarifications.
Not to mention the fact that the treasure reward for the final encounter was missing - how did THAT get overlooked. I had the errata beforehand, but I couldn't help but think that SOME reward (other than xp) was intended to be offered as well. After all, LFR now allows porting these characters over and many of our players intend to do that.