It must be used with its limitations in mind. The picture it paints is neither in real time, nor is it complete.
But I think you’d be crazy to takeoff in wet season without accessing a resource that shows you the general areas of recent rainfall and potential storm activity. So yes I find it useful. I wouldn’t bet my life on it though.
I tried to post the link by Pprune wouldn’t let me. Check out the ‘radar help’ page on the BOM website to arm yourself with the knowledge of its limitations.