You're going to hear this comparison with just about any team that plays small ball and takes a lot of 3's. And it's going to be terrible almost every time.
2 players set Golden State apart. One is the single greatest shooter in basketball history. No one else has a guy who can take 11 three point shots a game and hit them at 44%. The single season record for 3 point attempts is 678. Steph Curry is on pace to break that by over 200. The record for makes was Curry last year, at 286. He's on pace to break that record by over 100.
The other is Draymond Green. I don't know when Green sold his soul to the devil, but he apparently did, and his end of the deal is that he's developed into the most versatile player in the NBA since Magic Johnson. Maybe you can count LeBron, but LeBron is a lead dog, whereas Green is a supporting player, but anyway, Green has become some kind of monster hybrid who excels at aspects of the game you'd expect from 5 different positions/players. He passes like a point guard (6.7 assists per game), he shoots like a 2 or a 3 (nearly 44% on 3's), he rebounds like a power forward (7.9 per game), and he has enough bulk to guard power forwards and centers who are 6 inches taller than he is. Maybe Wes Unseld with a jumpshot is the best description.
Take those 2 guys, surround them with some big wing shooters and versatile defenders (Thompson, Barnes, Iguodala), and you have the best offensive team that anyone's ever seen.
They'll cool off, and someone will come up with a way to slow them down, but right now, they are unique.