Finally picked up Pillars again after the summer, and finished White March part 1. Here's a couple of quick notes on it, and on how the changes in it and 2.0+ relate to the criticisms I made in the review.
Soulbound weapons improve one thing and make others worse. Itemization in Pillars was bland because there were so many effectively interchangeable unique items, and even stuff like Clanfaidiagh and the Blade of the Endless Paths were rather unremarkable. Soulbound weapons are genuinely different and covetable. This is good. However, they still lack one of the major features that made stuff like Carsomyr, Crom Faeyr, or Celestial Fury cool: they don't require any investment in character-building to use. They're also rather easy to upgrade fully, and the way they were handed out was stupid, especially the Grey Sleeper with its upgrades carefully and inexplicably tailored to fit your particular biography. As it is, they're more like Monty Haul freebies than awesome rewards you have to work for. And, of course, they throw the difficulty out of whack even more. So, good idea, execution needs work.
Immunities are a really welcome addition. They force you to change tactics instead of repeating rote good-enough ones. Bump up the difficulty a notch and the system would really start coming into its own.
Party AI is also a welcome, if low-key addition. It removes some of the rote clicking from combat, without making it into a watch-the-game-play-itself kind of thing. I found the overall gameplay experience was smoother with it on, without drastically altering the way I play it.
The expansion itself was OK. There was a quite a lot of content crammed into a few pretty small maps, and it slotted nicely into the larger context. Everything except one optional fight was pretty easy though, and the extra XP and phat lewt will certainly turn the endgame into a yawn.
Overall I'm still enjoying the game -- even playing it again, even after playing it really intensively for the review. I'm not entirely sure why. The setting is probably a big part of it; I really dig the way it hangs together, including the conlangs which are related to each other in believable ways.