3-4 players don't make a football team.
If you think Greece won mainly because of 'luck', then you are wrong.
Tactics and good man management play a huge part in football in real life.
And again, don't try to compare something that has happen say once in a decade or two in real life, to something that happens say like 1-4 times in every season or two in this game. The same applies for injuries in this game. This is where some users or moderators or admins or people from Nordeus are wrong when they seem to come and justify things happening in this game using events that were in real life.
'Every one is trying to play with the right tactics' This does not mean that the tactics they have used were the most appropriate ones. Also, there is a big difference between the best tactics to use in relation to what you have in your team and the best tactics to be used to counter a particular opponent.