If you do, don't cry when I onos them :)
Once you get used to destroying buildings with the onos's charge ability you realise you can kill about 4 player spawn points in about 6 seconds.
Today I was an Onos, and I managed to get inside their base. there were turrets blaring everywhere, and marines, but I noticed they built all of their player spawns in a long straight line.
So you just line yourself up with the first one and charge them all dead in under 6 seconds. Bwahahaha.
This is bad strategy, of course, on the commanders part. Think of your spawn points as farms in other RTSes, you dont drop them all in a tight bunch, else they will all die at once. Far better to spread them out and additionally, build just one at every expansion if you can (ie, with commander box)
Its all about the precious, precious ammo.