From personal experience, not very. But my only direct experience has been in hotels, which obviously isn't a very high bar. I got about 25mbp/s at the Quest and about 12 at the "Quality hotel Grand".

Apparently my experience doesn't reflect the average though, speedtest.net reckons the average is 91mbp/s. I don't buy that though, as Melbourne (the state capital) only averages 68mbps and Mildura is a tiny little town hundreds of kilometres away from really anything. I'm guessing that if that figure is correct, it's only measuring people in either new developments, or near the city centre. In rural Vic, internet speeds very quickly evaporate once you go more than 5km or so (at best) outside of a major city