With two 737 over runs this week I'm going to go out on a limb and say that the importance of a good landing is........high.
I am not a training Captain, but as a line Captain the two biggest mistakes I see are
1/ not choosing a visual aiming point and sticking to it during the last 300ft.
2/ spending too much time scanning instruments below 100ft and not enough time looking out the window.
Ps, anyone know how much runway a 737-800 uses in a perfect flare that is in excess of following the three degree slope ?