When I watch GML level of players they always play very calm. There is almost no frustration in their losses.
While I loose I want to grab my keyboard and crash table with it. I blame myself mostly because I know I play so bad and don't make right calls, or skip scouting or lose the whole army while fighting up the hill and forgetting to break forcefields.
In HotS it is even harder as I don't know any HotS builds and got placed to bronze and still loosing 80% of the games.
In WoL I got placed to silver once again even being a top Gold in the season before that.