The current polls in the game are about the difficulties, Now I fully support having polls to get feedback from The Gaming Community but this one should be broken up into groups.
Levels 1 - 6 are fine if not a little on the easy side
Level 7 - 9 are okay other than the kill the captain mission should not be in co-o (AI does not seem to take into consideration that it needs to protect its captain and thus the matches are way too fast)
Level 10 - 12 are just a nightmare versus a level 15 alien ship (You might as well give us a self destruct option at the start)
Level 13 - above I honestly can’t say (I don’t have access to those as of yet)