First I played Jim's very competitive Tau list with a riptide wing in ITC scenario 4. I had some poor dice all game long but I managed to win by a wide margin by taking the primary, tying on the secondary, and taking all three tertiary objectives. You couldn't tell by my model count though. Jim whittled me down to just a couple of units left on the board; but my Pilgrims of Logic took no prisoners and he didn't have many models left either.
My most recent game was against Carey and his mostly Nurgle Chaos Daemon army in ITC scenario 1. Carey suffered from rolling high all game. Unfortunately, that meant he lost his plague drone and herald deathstar on a double-six against my one of my Knights.
Plus, he only got invisibility off once all game and lost his general to an explodes result when my dune crawler blew up, wounded Be'lakor on a six, and failed his save on a one.
At the end of the game, he had just one model left, a Nurgle daemon prince hiding in a building, and I had only lost my dune crawler, rust stalkers, and infiltrators. Despite my light casualties, it was a very close game and the only difference was the tertiary objectives.
In both games, I've lost my Infiltrators and Rust Stalkers. I use them fairly aggressively so that the rest of my army doesn't get shot at and I think that's mostly worked as a solid strategy for me. I don't really see them as pawns, because they are so gross in hand-to-had, but they are so fragile that having 2 wounds and FNP doesn't do them any good.