It's true. Very true.
I was in a game where I logged into the CC in the middle of the game. By then, things were going pretty bad. They've got 2 hives i think, or maybe even 3! I wasn't sure. We had no heavy armor, yet but we had hmgs and grenade launchers. Obvciously, the previous commander was heavy foritifying 1 resrouce node and the other node near eclipse command hive which was only to fall under the massive splashes of Fades nearby from the active eclopse command hive! A marine shouted, "We need to get that Eclipse command hive fast instead of hanging out at this node!". "Sure!", i replied. We had no heavy armor. I set up a radar at home base to allow phase gates at homebase and another phase gate near hive to send in attacking parties. We spawned in with light armor and HMGs and Grande launchers. We fought bravely but the massive offensetowers and Fade splashes and skulk rushes killed my poor light armor marines. There were 7 of these marines!! We put up a good fight, but not good enough. It wasn't really my decision to attack, but the marines. They fought for each other to get the hive, It was NOW or NEVER...but the counterattack couldn't succeeed without heavy armor. However, if I waited for heavy armor, that entire area would fall totally under the alien's control.
Lesson 1: Never send light armored marines against a huge alien presence. No matter how much marines there are or how much cool weapons and upgrades they have, they will ALL die. A huge alien presence is:
-they have skulks
-they have fades
-there are offense chambers to distract them
Actually, all you need are 2 skulks or 1 skulks + 1 offense chamber to wipe out a group of 7 light armored marines. Most of the marines there are inexperienced and disorganised.
So, i watched and waited for heavy armor. We are losing that area. No choice due to failed attack. But just then, a lone wanderer stumbles upon an active hive at the other end of the map from the left entrance. THat hive didn't had defenese at left entrance...So, this hive was weakly defended. I wanted to shout, "Hang on, build a phase gate first so everyone wack this!", but he already started shooting the @$(* hive. He alerted the enemy and embaassingly got killed!
Lesson 2: Bind an alias so to shout out , "That guy, don't shoot hive yet, you've got a good position. Send in reinforcements phased!"
You'll never know. With Light armored HMGs and Grenade luanchers vs 1 undefended hive coming in from the phase gates, that hive could be toasted and would demoralise the alien team.
Summary: Attack their archilles heel.
Even though you are a marine, be like an alien as well. Seize opputunity as well, like munching a CC. Being a marine is hard 'cause you need to balance between "opputunity" and "standard procedure".