I just tried a Wii Remote (without Motion Plus) with a freshly installed 10.7.5 system and found that:

1) although the Setup Wizard doesn't go beyond "paired successfully ..", RB adds the device to its list of known devices (=> Preferences > Hardware > Bluetooth Receiver). The Wii Remote then closes the connection at some point. I'll have to investigate, why the Setup Wizard doesn't proceed beyond that. Probably a 10.7 specific issue since I can't reproduce the problem on a freshly installed 10.8.2 on the same test system.

2) With the Setup Wizard now closed, whenever I press buttons 1+2 on the Wii Remote after that, RB will now successfully build a connection and I can control it with the Wii Remote.

As a rule of thumb, you should definitely avoid trying to pair a Wii Remote with the OS X Bluetooth Setup Assistant: 
a) a Wii Remote paired this way will not turn up in Remote Buddy 
b) the system's HID drivers may then claim "ownership" of the device and prevent Remote Buddy from accessing the device directly

What happens if your Wii Remote is turned off and you press a button (any button)? Does it start blinking its four LEDs now - or does it do nothing?

Best regards, 
Felix Schwarz