For the pantheon, it should be 1vs1 only. As it is, it is luck of the draw with what type of team mates you get. Sometimes you get newbs, sometimes you get good players, but to rely on random teaming for a tourny game isn't fair based on the skills of the individual. A 1vs1 would still work quite well and be fun.
This is coming from a guy who has played over 15 matches and not lost, and I would still like to see a 1vs1.