huh?
Last 5 years? Are you including THIS SEASON which hasnt even concluded yet?
Im gonna assume you arent and break down your argument.
Last 5 years:
2009, Thunder finished 23-59

2010, Thunder finished 50-32 and lost to the eventual NBA Champions in the 1st round

2011, Thunder finshed 55-27 and lost in the WCFs to the eventual NBA Champions

2012, Thunder finished 47-19 and lost in the NBA Finals.
Durant averaged 31 ppg on 55% FG in the series. Westbrook and Harden combined for 39 ppg on 41% FG
2013, Thunder finished 60-22 and lost in the 2nd round to the Memphis Grizzlies. No Westbrook due to injuries. Starting lineup of Reggie Jackson/Thabo Seflosha/Serge Ibaka/Kendrick Perkins with both Kevin Martin and Derek Fisher playing 25+ minutes per night in that series
So AGAIN, Kevin Durant has done his thing and has only gotten better individually and his team has went further every season. Last year, he had no 2nd option and lost to a much better Grizzlies team when Westbrook went down due to injury. He's moving along at a great pace and hasnt warranted any "slander" up to this point.