LSM are winning because they have more players in a match. The matchmaking allows one team to have 3 players more than the other. With everyone playing LSM and the other factions starving of players, there's more matches where LSM have more players than the enemy, hence more wins. This gets compounded with people who leave mid match on the enemy team, which can give LSM an even bigger player advantage in terms of team size.
didn't do the campaign not going to do it either. Just stayed with chaos and orks. Some good came of it though, was able to get my vet for chaos.
It's just that people now really want to win, instead of the "Meh... whatever" mood if you get nothing for your victory i guess.