I personally hate when pundits, journos, players, coaches and fans are all saying that penalties are lottery. Well they are not. For good and skilful players and goalkeeper at least. Spain-russia and especially croatia- denmark are best proof. Some players placed their shots perfectly. Did you see how kramaric took his shot? Or ramos? No luck in that shots. Pure class. On the other hand schone, pivaric and badelj? That was just bad. No looking at gk, they "told" gk from the start where shot will go. Also people confuse luck with mentality. If some players or teams are chokers( england, croatia) then you can't say that they are unlucky.
And goalkeeper role... Many pundits today talked about subasic, schmeichel and de gea. Subasic and schmeichel read nearly every shot and were in heads of penalty takers. De gea wasn't. He is best gk in the world but he was not good in that penalty shooting. Remember cilessen? Guy who never saved a penalty? Is he unlucky? No, he is just not good at saving penalties.
Of course there is some luck. I am not denying that. Like in everything in life and sport. Inch right or left can mean goal or save( modric and aspas) but in general "penalties are lottery" is one big football lie invented by people who are trying to find excuse for defeat.