What you're referring to became extremely rampant in H2 MM as people who often just stand by'ed learned that they could simply get host and then kick most of the other team out. I believe it was referred to as bridging. I wouldnt be surprised if some people still did it on purpose but not near as often now in my experience...
man.. H2... great fun in MM... but definitely broken when you consider how easy it was to mod, standby, bridge, etc....
[Edited on 01.13.2012 7:53 PM PST]