How do you nicely tell a player who apparently only looses to me because of bad dice and not as a result of my experice of playing the game since wave three or flying my ships well, that he needs to fly better and not blame the dice?
Yeah, this is always an awkward situation. It's happened to me a couple times, and I just say "sometimes dice will go your way, and sometimes they won't, it's too bad they didn't go your way this game." and I leave it at that. If a person is ready to blame their bad dice, or your good dice, they're likely not going to be open to a discussion on tactics. So in those cases, I thank them for the game, and move on to the next one.