Photoshop CC is doing a poor job of rendering bitmap smart objects, and I saw Chris Cox mention the checkbox to enable anti aliasing for placed smart objects. This works with vector smart objects, but this box is grayed out for bitmaps that I've converted to smart objects. The smart object bitmap renders poorly when manually rasterized too. I don't recall having this problem in previous versions of Photoshop. For now I'm going to avoid converting bitmap elements to smart objects so I get decent transforms.