For what it's worth, I took UW to FNM last week. Died on Turn 3 (while on the draw) to Breach Titan, then got Chalice'd for 1 turn 1 game 2 with Surgical, Field, and 2x Path in hand. Then I lost to regular old Galvanic Blast Affinity on turn 3, twice (game 1 and 3, each I was on the draw. Game 3 I had turn 2 Stony Silence).
Even Eldrazi winter and treasure cruise delver was less oppressive