It depends entirely on what the paper says. If it says "we found the perfect answer to this problem!", then yes, that is shameful. But if it says something more

It depends entirely on what the paper says. If it says "we found the perfect answer to this problem!", then yes, that is shameful. But if it says something more like "here are some potentially useful calculations, but the results are ultimately unsatsifying because of the cut-off procedures requiring arbitrarily chosen parameters", then it's still a useful result.