It is deeply ironic to me that the biggest map, has the least number of paths marines can take because of the water and layout and travel time.
The Marines will ALWAYS be coming from the west and ALWAYS along the same paths.
Aliens dont have to watch for flanks. They know exactly where the marines will be, and exactly the most popular roads to ambush on.
I took a copy of the map and drew it up.. Almost every round is like this. Marines can be found in the red area, and almost nowhere else. The orange routes are the same ones I see them travel over and over again.. With the green checkmark the spot where they setup a fob, that gets overrun and everyone killed retreating.
And even my marks are generous, because there are pockets in the red area no one goes to (like the graveyard).
Please feel free to disagree.