1.1 is very balanced, its more map dependant than anything. Heres some statistics from Aussie Assault, 24 player max server
1. atcs
Times Played: 5228
Alien Wins: 2380 (45.5%)
Human Wins: 2691 (51.5%)
Draws: 157 (3%)
Avg. Game Length: 22:43
2. tremor
Times Played: 1820
Alien Wins: 696 (38.2%)
Human Wins: 1087 (59.7%)
Draws: 37 (2%)
Avg. Game Length: 16:20
4. niveus
Times Played: 1224
Alien Wins: 638 (52.1%)
Human Wins: 565 (46.2%)
Draws: 21 (1.7%)
Avg. Game Length: 18:18
5. karith
Times Played: 883
Alien Wins: 549 (62.2%)
Human Wins: 296 (33.5%)
Draws: 38 (4.3%)
Avg. Game Length: 22:46
8. nexus6
Times Played: 622
Alien Wins: 334 (53.7%)
Human Wins: 254 (40.8%)
Draws: 34 (5.5%)
Avg. Game Length: 22:19
10. arachnid2
Times Played: 547
Alien Wins: 336 (61.4%)
Human Wins: 185 (33.8%)
Draws: 26 (4.8%)
Avg. Game Length: 19:08
Basically, the smaller a map is, the more even it is. The larger it becomes, the more alien bias it becomes. The more open and straight it is the more human bias.