Currently seeing a game with a 25% modifier, Rounding mode: weighted random...
So what does this mean really??
What is the best strategy for this game setting?

Go to Game > Analyze attack. If the attack works most of the time, it might be worth doing the attack.

Here's the full explanation: https://www.warzone.com/wiki/Luck_Modifier

In short, there are two main factors:
-kill rates, the default is 60% offensive and 70% defensive and it's how all games are played unless you really want to create something weird;
-rounding mode: weighted random and straight round

What this all means is that if 3 armies attack, they should kill 1.8 opponents armies by default (attacking_number*kill_rate).
If it's straight round, it will always round to the nearest number, so it will kill 2 armies.
If it's weighted random, it will have 80% chance to kill 2 armies and 20% chance to kill only 1.

Then there's the luck modifier that can go from 0 to 100%. It's purpose is to make things less predictable as the number goes up. I suggest to always leave it at 0%. And use cyclic move order while we're at it.

or not do that, and then not be boring :)

Edited 12/6/2018 12:51:44

Some people enjoy beancounting. And some enjoy the game.

^Exactly, some just check whether it's SR or WR and enjoy the game, without pressing the analyze button every attack.

Some people enjoy winning when they outplay someone else. Some like free wins.

there is plenty perfect information games to play out there, they are actually quite famous

I heard this game called Chess is upcoming