"Effective" I think covers many different things. The unertl was obviously an effective scope from a shooters perspective. Heck, I've used several, original and repro, and they are very effective. That said, there are reports of interior fogging in the tropical climate being the issue, as well as the fragility of the setup during "normal" use. The latter alone would be enough for someone at the time to say "not effective in combat".
Keep the original documents coming. Can we not though descend into the chaos of "I said you said I'm right you're wrong..." attacks again? I would really like to see this topic continued without getting closed by the moderators yet again.