I have the SH3 in Modem mode, and have NO gaming issues.
Remember its the CHIPSET that is the problem, VM are not the maker of the CHIPSET, thats Intel's fault.
VM just buried there heads in the sand once the problem came to light.
-- Red (VM SH2 AC Beta tester) Running on 350Mb VM service with SH3 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech. My advice is at your own risk.