I tried something simular to that one game for fun.
I got 2 bases up with full SP, and parked 3 elephants on opposite sides of each other around his base just out of his LOS. I then queued up marines in all 3, and set the rally points near the base. I just kept queing more marines nonstop even though they were being slaughtered. Going in to RPG every once and awhile. (only tech 2 marines.)
The constant pressure eventually overwhlemed them and I took them out. It was a pretty fun game actually.
My teammate called me a fine gentleman and threatened to quit when he saw my elephants heh.
If you have the economy to do a proper spam, then it does work quite well. It kind of reminded me of the good ol ling spams of starcraft.