It's pretty hit or miss. Some night there's only 1-2 pops all night. Other nights, like tonight, there's pops for like 4 hours nonstop. What I've noticed is that during the week we start queuing around 7, but games don't start popping regularly till around 8-9, which sucks because there's several of us east coasters in deadweight that usually have to log by around 10 server.
That was a good game tonight. I look forward to more against you guys. We have rateds scheduled only during the week, but sometimes we have enough on and can form over the weekend as well.
edit: For those interested, try and bump this thread so we can get a customer service response about a rated warzone change in 1.5.