I'm back on Mass Effect 3. I played solo against Cerberus and I ALMOST did it! I died with 8 seconds left in the extraction round!
But it wasn't with the Katana shotgun (wave 10 with that). Nope, I have a new weapon of choice now, assault rifle. The M8-Avenger III with the Stability Damper V (70% + stability) and the Precision Scope V (35% + accuracy/scope).
My downfall was that they were moving in all at once so I didn't have time to focus on the Atlas (no rockets) that drove me out of cover. If I held out for 8 more seconds... on the bright side I find that my new choice murders Phantoms especially when aided by grenades.