For such a small team upfront the Warriors do a great job defending the painted area. Defensive Player of the Year candidate Draymond Green really does a good job of patrolling the paint and having active hands. The only weakness that the team has defensively is Steph Curry and that may come to bite them like it did last year. Other than that they play really good team defense that was only matched by the eliminated San Antonio Spurs--none of the remaining teams out East are even close to their level of efficiency.
The Warriors have three guys that could drop forty point even given night, it take a monumental effort to keep at least two of those guys quiet in a playoff game. These guys are Durant, Curry, and the often forgotten Klay Thompson. This trifecta can be deadly from any part of the court and may be the best shooting trio in NBA Finals history. Not only are they deadly from behind the arc, they have amazing free throw shooting percentages. Durant and his size in particular will be issue because he can rise above anyone to shoot a largely uncontested jumper--teams can only hope he misses a few when it counts.
Warriors have a coach that is reportedly going through some serious medical issues--Steve Kerr. This may act as motivation for his team overall, because the idea of seeing an ailing Kerr raising the championship trophy, after the turbulent year he has had, would be remarkable--a legitimate feel-good story in the NBA. The Warriors also have to make up for their collapse versus the Cavs last year, essentially throwing away the glory of being a 73-win team. Kevin Durant also has the pressure of winning after his off season stunt, if he loses the backlash would incomprehensible; so believe that him and his teammates are extremely focused.