And for the bunker point that was brought up in the last few posts... just build an at gun, or use smoke and demo charges and just walk up to it, it's not that difficult, three shots or one little 45 muni boompack and 150 mp and 60 munis are down the drain. Great for stalling, but not good enough to keep a halfways solid player off a point if he is determined to get there.
Great for stalling, exactly.
In team games that is often all you need, just a bit of time to plonk a marker down and send units over to deal with it.
In 4v4 you often max out your pop so the ability to expand your field presence further than the enemy can make a difference.