The refs are allowing more physicality in the series, and the Cavs are capitalizing on it. Losing Irving and Love allowed the Cavs to put in solid defenders, and really crash the boards. TBH, I couldn't see this coming, I didn't realize that the Cavs have the personnel to really shut down a perimeter offense the caliber of GSW.
And the GSW are killing themselves as well, not running out on the break and doing what they are best at doing. They seem hesitant on offense and unsure of themselves. Thompson and Iguodala are playing well, but they really need Green to step up and not let Lebron bully him to no end.
Not sure what is wrong with the defensive SF in the playoffs this year. First, Kawhi got owned by Matt Barnes, now Draymond Green (and Harrison Barnes) are getting absolutely neutered by Lebron James.
P.S. For all those who laughed at how the 80s and 90s defense of hard fouls isn't really defense, look at this series. The Cavs aren't even putting in hard fouls, simply playing more physical than the pretty boys are accustomed to, and they are shrinking like a violet in the hot desert sun.