An actually scientifically conducted poll in 2016 found the exact opposite: https://drive.google...VJlzJbNvB_/view
My guess is that a lot of people were more supportive of them beforehand but then seeing how they actually turned out, the budget overruns, etc, might now have a much less favourable view. I think if the polling question had said "with good planning, competent oversight and on budget", the result might also have been different.