if you want variety i think you shouldn't have global bans ... i think global bans don't are good for variety ... you often end up with mirror match ups and there is no need to ban the good civs (i'd like to see those civ statistics counting only the games without global bans (even if the numbers are way to low for having some reliable results))
well i played two games and none with same civs so i think is good change after all that random picks tourneys whitch was ending to same 4 civs. When picks are similar u cant blame banning system, its simply about the power of the civs u cant push ppl to pick different only cause u wanna see various vill chicks. ;-)