X-Com Long War 2

Well, in vanilla X-COM 2, you could only graze against snakes. For everything else, you rolled a single roll.
The LW roll formula from XCOM1 was actually a triple-confirmation roll compared to XCOM2's single-confirmation roll. I'd assume they reworked graze rolls into their triple-confirmation system, which could also account for the increased graze probability if graze is a possibility on every step of the confirmation tree that becomes more weighted as you make confirmations.

I think it's probably something like this, based on what I little I remember from LW1's formula:

So LW is basically:

Miss = miss
Hit + hit = hit
Hit + graze + graze = graze
Hit + graze + miss = miss
Every enemy can be grazed

While vanilla X-Com is:
Miss = miss
Hit + hit = hit
Hit + graze = graze
Only few enemies can be grazed.

Right?

Basically the ways you can graze a shot has increased while the ways to deny a graze has also increased unlike in vanilla where the only real way to deny a graze was to have a 100% shot (and this was added post launch).

I really like those new briefing screens.

Is there any disadvantage to taking a mission you can't really complete, killing a few aliens and getting out?

Whether you evac without completing the mission or you skip the mission entirely, the effect is the same - and unless the mission you're skipping is a priority one (troop column ambush, supply raid, datatap defense, etc) the effect is zero.
Kill XP is the barest fraction of vanilla values, though, so you'll need to kill an absolute shitload of guys in order to level up your troops. It's good for gathering loot, though, for sure.

The penalty for skipping priority missions varies, but it's usually either an increase in Advent Strength in the region (which increases base enemy presence in missions in that region and makes them harder to detect with a high infiltration time), or something like you can't gather intel/detect missions in the region for a month.

3 days late, but thanks user; if the game runs much better than it did on release I might be less of a faggot and buy the fucking game. It barely functions on my rig as is

>it's one of those "storm the advent broadcast tower and hack the giant jew ayy mind control dish" missions from the end of the vanilla campaign
>the rest of the vipers proceed to fuck my team beyond belief and I complete the mission by the skin of my teeth with everybody poisoned and gravely wounded

God damn, what's going to be waiting for me at the Regional HQ? My money's on a pod of 5 Archon Kings surrounded by Sectopods.