Add me to the list...
I think it was working better a few weeks ago but it might just have been lucky...
Anyway, when I power on my iPad, on the passcode screen, there is no WiFi symbol, but when I enter the passcode, it shows up. But often, I have to go to the setting>Wifi to see the Wifi network.
Once I'm connected to the network, (and I can double-check with my router that the device is actually connected*), pretty much half of the time, I can't connect to the Internet (no emails, no Safari, no iCloud, no App store, no... Internet). My iMacs, my Macbook Pro, my iPod and my iPhone (even when I turn 3G data off) are connected wirelessly to the same network without any problem... ever.
The only thing I found that could work was to shut down the iPad and turn it back on. Sometimes I have to do this 3 to 4 times (sometimes even more) before I can connect to the Internet. Frustrating at least...
If anyone think of anything else (before 7.1 is out... fingers crossed), let us know!
*With the router, I can not only see that the iPad is connected to the network (LAN) but I can see that the other device are connecting to the Internet (Internet sessions) and I can see that the iPad don't... no error message on the router, just no Internet session for the iPad. As I said, I can see the iPad on the network from the router and from my Mac wirelessly in iTunes.