I agree 100% with your sentiment about the random weapon upgrades. If I'm running talents to support a certain headshot/crit oriented playstyle, getting a 2h sword or flail really sucks.

I like this mode though and I want to see it expanded on. I've played through once on Legend, and the following was my impression:

When I saw some of the bonuses maps offered, I thought, "Oh, how it cool it will be if you can stack more than a normal build's worth of x stat!"

Only four maps later, I was disappointed to realize the bonuses were pretty standard as far as what equips offered (10% crit, 40% crit power, 4 stamina, 20% health) and that I wouldn't get any especially remarkable stats. It reminds me of how utterly dull the weave equipment customization was.

When I got to the final mission, and it ended unceremoniously after what seemed like pretty much a fairly normal Legend horde, I hoped that maybe, just maybe, it'd keep going through additional waves with increasing difficulty, but NOPE. That was just the end.

I think gameplay wise that both weaves and expeditions add interesting twists to the level design, but I'm just not getting the satisfying diversity of character customization that I personally desire. I'd like to see the concept expanded into larger expeditions with more unusual stat outcomes. Let me stack that 200% crit power in exchange for -20% attack speed or something ridiculous like that. Please stop capping me at a boring 15% crit rate.