I'll pop in my 2cp as well, since I just stumbled back on this after playing a few adventures in:
1. What do you think of the one-boon-of-a-type rule? Do you feel like you miss being able to toss multiple blessings at a problem?
We came into the adventure with this rule basically on probation, and were prepared to house-rule it away if it was too much of an issue. However, the upgrade to supportability of cards, particularly for allies and items, but also a lot of weapons and spells, meant that we've never strongly felt the urge to actually change it back. If anything, the rule may have improved our play since we may have been too aggressive throwing blessings at problems in the old adventures, which left us dry for more important checks later.
2. How much did your group use the Avenging mechanic? I feel like it's something that people often forget about, but it can be VERY useful in some situations.
We have been really bad about this, and I think have maybe used it once? I like it a lot in concept, but it's both hard to remember, and in general I'd just rather throw more support cards at the initial check.
3) How large is your party?
We play six characters, each player playing 3 each. It definitely causes games to slow to a crawl at times, but we find it fun. Overall, I think the new rules actually make large groups more fun, as it's not just a blessing-spam-fest (In most previous adventures, you always wanted to max blessings before getting any other card feats because you needed so much explore and cards to help others, and blessings were the best at both of those)
4) Which blessings do you find are better - the old ones (where you could custom-tailor your party with double-dice blessings for tasks the party is weak at) or the new ones (where you get a bunch of effect, but very few overlaps.
First off, we absolutely love the hour mechanic, so the new blessings win almost exclusively on having those. I think we also both agree that the variety instead of 5-of-a-kinds is also cool, especially since you can still stock up on certain deities if you want, they just have different names. I would like more of the old style double-blessings to be included, but not so much that I'd want to go back to the low-variety blessing count.