He basically never had a bad game in a series they even lost. Outside of Jordan, that can't be said for any other player in history. Even LeBron played poorly in several series his team lost, 2007 Finals, 2008 Boston, 2010 Boston, 2011 Finals. Durant never had anything like that outside of 2010 LA when he was 21 years old.

They just lost to better teams every year, they lost to the NBA Champions in 2010, 2011, 2012, 2014, and what should have been 2016. 2013 was Westbrook's injury and 2015 was Durant's injury. Just look at their numbers.

2011 WCF
|||Tota|Tota|Shoo|Per|Per|Per|Per|Per|Per| |-:|:-|-:|-:|-:|-:|-:|-:|-:|-:|-:|-:| |Rk|Player|Age|G|GS|TS%|MP|PTS|TRB|AST|STL|BLK| |1|Kevin Durant|22|5|5|.553|44.7|28.0|9.4|4.0|1.2|1.4| |2|Russell Westbrook|22|5|5|.478|39.0|23.6|4.8|4.8|1.6|0.2|

2012 Finals
||||Tota|Shoo|Per|Per|Per|Per|Per|Per| |-:|:-|-:|-:|-:|-:|-:|-:|-:|-:|-:| |Rk|Player|Age|G|FT%|MP|PTS|TRB|AST|STL|BLK| |1|Kevin Durant|23|5|.650|42.6|30.6|6.0|2.2|1.4|1.0| |2|Russell Westbrook|23|5|.500|42.3|27.0|6.4|6.6|1.0|0.4|

2014 WCF
|||Shoo|Per|Per|Per|Per|Per|Per| |-:|:-|-:|-:|-:|-:|-:|-:|-:| |Rk|Player|TS%|MP|PTS|TRB|AST|STL|BLK| |1|Russell Westbrook|36.9|.544|26.8|5.7|7.3|3.2|0.3| |2|Kevin Durant|39.2|.560|25.8|7.7|3.2|1.2|1.2|

2016 WCF
|||Shoo|Per|Per|Per|Per|Per|Per| |-:|:-|-:|-:|-:|-:|-:|-:|-:| |Rk|Player|FT%|MP|PTS|TRB|AST|STL|BLK| |1|Kevin Durant|41.3|.539|30.0|8.0|2.9|1.7|1.7| |2|Russell Westbrook|39.1|.509|26.7|7.0|11.3|3.7|0.0|

There's really no blemishes on his resume outside of leaving OKC. He never choked, he never let the Thunder down. Yet everyone believed he was responsible for their inability to win a title.