This year's edition of the FIFA World Cup continues to be thrilling with unexpected performances from tournament first-timers and surprising results from some of the favorites.

All 48 teams have now played a match at the tournament, and already there are some big takeaways from the opening week. Here are five things we learnt.

Criticism began to pour in about how the quality of the World Cup would likely be affected not long after FIFA announced an expanded 48-team tournament.