Goal fest

I sat to watch premier league with my brother.world cup has just finished and even my brother who never watch premier league joined me due to craze of the world cup football.Tthe world cup where goals were very hard to come but the premier league started with a bang ,where every other team were netting 6 goals.Then came the big question from my brother  "Why are there so many goals in premier league than in world cup?"
At that moment i answered him "though they are same  players but when better players combine and train together, day in and day out,they are supposed to be formidable force .The club football is always better than country football because there are limited players to choose while playing for the country but for club football whole world is there to choose so that you can get the right player at right place.there is lot of money invested in the clubs,the players are highly paid and trained properly." is this the perfect answer i don't know but later i thought about it.
Does scoring 6 means the teams winning played great football or the losing team played worse.my answer would be right if the winning team was superb but i would be proven wrong if losing team were worst on the day.