to respond to owl, the thing i think is broken, is that 5 onos (the aliens highest evo) with all upgrades, is in no way comparable to 5 ha's with all upgrades, hmgs and such...
when it comes down to it, fully upgraded marines> fully upgraded aliens
I think that when they are maxed out, it should be fairly equal, and that games should be decided by strategy, not firepower
and the siege cannon, I allways have thought it was out of place... if we dont have beam weapons, how do we have a portable artillery cannon of gravimetric doom?