The Thunder are loaded with talent. Donovan is a smart coach who is figuring this out as he goes.
They went through this on the broadcast last night, but here goes the Thunder playoff history since 2011:
2011 - Very young Thunder team loses to the NBA Champs Mavs in the Western Conf. Finals (2-1 in playoff series with Westbrook and KD)
2012 - Thunder takes the next step winning the Western Conference beating in order: the Mavericks (sweep), the Lakers (4-1), and the Spurs (4-2). Thunder then lost to the NBA Champion Heat. (3-1 in playoff series with Westbrook and KD)
2013 - Thunder lose Harden; Thunder have the best record in the West 60-22; favored to again face-off against the Heat in the NBA final; Westbrook gets hurt in the NBA playoffs first round; without Westbrook, the Thunder lose in the West Semis; (1-0 in playoff series with Westbrook and KD)
2014 - Thunder finish with 2nd best record in the West; beat Memphis and the Clippers in the first two rounds; lose to the NBA Champion Spurs in the Western Conference finals. (2-1 in playoff series with Westbrook and KD)
2015 - Durant breaks his foot; Thunder miss the playoffs.
2016 - Thunder finish with the third best record in the West behind the record breaking seasons of the Spurs and the Warriors. (2-0 in playoff series with Westbrook and KD)
Since 2011, the Thunder are very impressive 10-3 in playoff series when they have Westbrook and KD, and all three losses were to the eventual NBA Champion. Also, although they don't have Harden, argument could be made that this is the deepest (and definitely the most physically imposing) of any of the Thunder teams over the last 6 years. If this team can avoid last minute meltdowns, very capable of beating GS and Cleveland to win it all.