Another data point...

I booked 1 night at the Como Melbourne. Rate on accor.com was $212, but I found one for ~$200 on Expedia. Submitted form, but never received any response. On the flipside, the Plantinum benefits the hotel offered were pretty good (very nice suite upgrade, 2pm checkout, free wifi), and not sure I would have received them if I had booked via Expedia.

But anyhow, as everyone says, don't bother with Accor BRG.