I just use the site for messing around in quick play... the only times I've tried it in multiplayer was on a guest account doing games called cheaters, and every time it kicked me within the first unit or two I produced, even if I waited for a while. So I just assumed the anti hack system had been made to stop it. I also haven't seen anyone successfully hack in that style in a long time, so again didn't think it worked anymore. The only hacks I've seen work in 2.7 are the wall hacks, and I've seen a couple people who have made units with no buildings built and got away with it.
I've made enough marines to essentially one shot the base before in that version :P. They take it from full to zero in less than a sec... not really a 1 shot since they kinda shoot machine guns and dont all start at the same time but yeah basically 1 shot :P.