1. Break: GSL is what the Korean scene is all about. With the last season of the year being over, many Koreans simply took a break. We heard from some sources that some Korean players that played the season finals came into the tournament more or less unprepared. And I‘m not blaming them whatsoever, especially in a year like this, the value of such season finals is not that big, in my opinion.
2. Servers: even if it did not affect the matches themselves, I could imagine that the server discussion de-valued the tournament from a Korean perspective. It‘s just not the same and one of the players HAS to be given a disasvantage over a best of 3/5/7. And obviously it takes something away from the sincerety of the tournament.
3. Playtime: Again, probably no major affect on the outcome, but most definitely an effect on the perception of the tournament. I cannot imagine someone taking a tournament truly serious if he has to play far past midnight. It is obvious why the times were chosen that way, but Koreans were definitely put in the worst position among all players.
In an offline tournament, I would still see Koreans outperform the Europeans (minus Clem, Serral, Reynor) by quite a margin. And I hope the Katowice can take place as an offline event next spring.