I have to agree with most and disagree with some.
I think a) it's a great game, my players love it, and b) it's fairly easy to run.
I'm a first time DM, with only about 4 years of gaming experience under my belt. Sure, in a couple of places, you have to put a door on the map where one has been left out (or a kitchen... little things). However, I find the combats well described and fairly easy to run, the plot threads are consistent, and my players eagerly try to tie things together (sometimes things that don't go together). You need a fair bit of common sense, and the ability to wing it every once in a while, but it's a fantastic campaign.
I'm running two separate groups through the game. We've been playing (weekly) for about 8 months, with a total of 10 players, 5 in each group. My player attrition is exactly 0. I recently found out that a woman who plays in one game was offered a new, and better, job that would have required a move. She and her partner (who also plays) decided that they couldn't leave, in a large part because they wanted to finish drow wars.
Run it - you'll love it, and your players will too.
js