Juno, that spot has so many benefits.
First it prevents hummie and alien camping!!!
Second, if hummies have the slightest idea what they are doing, aliens will never reach s3.
Fact is, there is absolutly no reason why hummies don't win once they reach s2, on any map. They have all they need to raid the alien base, nade/saw OM and use helmets to kill every last alien or egg.
S3 doesn't do much for hummies aside from lucy and bsuit whereas aliens get a lot more then that.