So today I was procrastinating, and what came out was a little spreadsheet that shows the averages, medians , minimum and maximum values for damage and range of individual dice, marine weapons, and invader demons. "Medians" is bold here because it's more important than averages in this context, with the deviations of the dice being so high, but rarely included in player aids.
The reason why I created it is because I looked far and wide on the geek and found plenty of such math sheets, but none that were both compact and comprehensive (to the extent that I wanted them to be). The one that was as comprehensive as I wished (including percentages per damage values for each weapon, sweet) didn't have a summary of invader demons at all.
Have a look at it here (pdf) and tell me what you think! I'm of course happy about people pointing out errors as well, or giving constructive criticism.