And sadly that is very, very true. Nothing annoys me more when a group of 2 or more terrorist rush to the water. Once they are there, they can pretty much control the entire game. But my tactic is usually the bridge crossing tactic. I load up with a super shotgun, HE gren and Flash gren. Throw flash gren first (smoke gren works too), then throw HE. The HE gren (if it doesnt kill them) will send all those who were hiding in that bridge cross room reeling for cover.
I cautiously cross the bridge, continually firing on the corners till I make my way across.
If Im lucky, my team will have the terrorist at the gate pinned down, where I can easily pick them off.
And, if that doesnt work, my decal of a CT comes in real good handy.
When I used to play TFC, I normally would play as a spy. I made a decal that was really a SS of a blood spatter on a wall. I place the decal on the wall,feign a death, and wait for unsuspecting victims.