I think there seems to be a way to big difference between normal and hard.
Normal is pretty easy. In the first few matches in a tournament it doesn't even matter if you do anything or not. The AIs on your side will make sure you win.
But switching the game to hard makes it way too difficult.
I can't put my finger on something specific that makes this difference, but like Trankillity I also noticed that the AI on my side are complete idiots when playing on hard. During the first seconds of the game, they run ahead... but then stop just before enemy territory. They don't even capture flags even if the flag is just close by and no enemies are around.
The enemy AI however runs into my territory and starts bashing everything to pieces... and the match is pretty much lost to begin with.