History tells us that Costa Rica is a team that is very much capable of creating upsets. Remember the 2014 World Cup? They were placed in the toughest possible group, along with England, Italy and Uruguay. Everyone expected them to finish at the bottom without any wins. And then what happened? They won two of their matches, against Uruguay and Italy, and then held England to a goal-less draw. In the end Italy and England finished at the bottom of the group and were eliminated. So it will be risky to underestimate the prospects of Costa Rica.
We in Europe often underestimate the Asian, African or North American national teams because we don't follow those teams and players.
I see that almost no one believes that even one team at the upcoming World Cup, which comes from Africa, Asia or North America, has a chance to pass the World Cup group.
Given the extreme weather conditions in Qatar, and other reasons, I'm convinced that at this World Cup there could be more surprises and unexpected relegations of favorites from the competition.
Along with Costa Rica, I see Japan, South Korea and some of the African national teams as possible surprises, to which the weather conditions will probably be more suitable.
As far as Costa Rica is concerned, as far as I remember, at every World Cup they played in, they created a lot of problems for the favorites and they were not an easy opponent for anyone.