A LONG LONG TIME AGO IN A PATCH FAR FAR AWAY:
Marines would land on the planet.
They would encounter the aliens.
They would put up a meager push.
They would get pushed back.
They would camp at the FOB.
They would get overrun at the FOB.
Then they would win or lose on the ship.
TODAY:
Marines now have enough resources to build defend-able FOB's.
Marines now have sniper kits to counter boiler sieges.
Marines now have flamers to counters lurkers.
Marines now have medkits for increased suitability in pushes.
Marines now have improved CAS and will be getting JTAC kits in the future.
Before you go and nerf the aliens LET THE META SHIFT.
I played aliens a few days ago and the marines set up a great FOB in the middle of the map.
Instead of waiting for the marines to move out, Queen ordered it siege'd and we did, many of our T3's were killed, and we still kept trying to break down the FOB. Instead of pulling back and killing the marines out in the open, or flanking, everyone still kept trying to break it down with young T3's. It didn't work. The marines depleted our larva, and then pushed into our hive and killed us all.
This is exactly how it should be, siegeing the marine FOB while they are at full strength use to work, so that is what you did. Now we actually have to weaken them first, but people have not caught on to that yet. The updates are good, but give them time before you make more changes to the game. That's all I'm trying to say.