Effective? They didn't have ONE kill, but killed more than one pilot. None were successfully flown after a powered launch, if I read the history correctly.
I seriously doubt it could have been effective in the condition it was in when the war ended. Perhaps with some development and reliability ... maybe, but as fielded? No way.
It would be very neat to build and test one today, but we'd probably want landing gear ... so it could be re-used ...