The only way I can think of to "rig" a game is if you hand-picked all the cards (or a group of cards) for a kingdom, to create a game that you were very very skilled in playing. But nothing in your post suggests that this was the issue in your case, right?
(I have seen games like that, but it's usually completely up-front. 'Oh, this is gonna be a Duke/Duchy game.' "Oh, this might be a Gardens game.")
[Question to Ingix/others: If someone has set up a game and I'm thinking of joining; is there a way for me to see, in advance, what cards (if any) have been hand-picked, kingdoms that have been excluded, etc.? I've always been the one setting up the games in my own matches...and all of those have been completely randomized cards, from all kingdoms. So, I have no idea what the other person actually can or cannot see, as part of the matching process.]