http://www.ownedwell.com/utstats/?p=match&mid=10064
Viperz and I were 1on1 at Bertha - Viperz beat me pretty easily since he is a much better player, but Gizmo and Pete were able to help out just enough to make it only a 15 point spread (11 kills combined on Viperz). I also got some shots in on Miracle which helped Gizmo dominate that point to turn the tide in our favor. It didn't seem like much to me (a few hits here and there as I was making my way from spawn to Bertha), but it had Miracle raging at me after the map finished. Those acts of teamwork were the 20 point spread which gave us the win.
On the contrary, the next map, http://www.ownedwell.com/utstats/?p=match&mid=10065
Their team gave ACF no help whatsoever on the low point. It was just me vs him, and I completely dominated him. Most times I play Low, there are people running through and helping on a fairly consistent basis (whether it is my teammate or enemies). If their team provided some team support to ACF, they might have been able to win. A few hits or kills on me early and maybe I would have been thrown off, which would have given ACF some time to get his shit together.
Teamwork is very important in sDOM. That said, it isn't as popular as iCTF - just a fact.