The Suns Shock and Awe offense.

I seriously believe that the Suns new offense could be legendarily good in terms of it's effectiveness, and it's a 4 part offense:

1. Center/PF oriented power offense. The Suns might now have a twin towers for the ages with Shaq and Amare, and remember both of these guys shoot 60% from the field, which means that they both command a double team, unlike the Robinson/Duncan duo. Defensively, you *have* to use 3 players to cover the two of them, meaning that you're leaving a big gap on the perimeter. The Suns don't have anyone shooting less than 34% from the 3 pt line, and that percentage is about to go up with all the free space caused by a missing defender.
2. Midrange game. In Grant, Boris and Amare, the Suns have a midrange game that's probably as good as any team from the 70's or 80's. All three of those guys can shoot from 18 ft in, can attack the rim, and more importantly can pass when the offense breaks down, either to Shaq or Steve Nash.
3. Steve Nash. In my opinion Steve Nash is the most effective improvisational player to ever play the game. Not as good as Maravich from a creative point of view, but far more effective. In addition he is the best player in the game today at playing what I like to call the "5 fingers of one hand offense", which is to say that he makes better decisions and more effectively directs the actions of other players than anyone else. And just for completeness, Steve is also the best passer playing today and one of the best ever combo passer/shooters. What Shaq does in this offense is free up Steve for more space, and that's going to make him even more dangerous because he'll have better shooting opportunities and more time to make decisive passes to open players. The only question comes from Shaq's position in the paint when Steve tries to penetrate and dish. Will he be an obstacle to Steve, or will Steve use him as a screen to do greater damage.
   
4. Downdown game. The Suns have the best long distance offense in the NBA.
   

It's my theory that even great defensive teams can only effectively defend against at most three of the above options, but not against all of them. Any team then has to pick their poison.

The other point that needs to be mentioned is that the Speed-ball, for which the Suns have been famous is now plan B, which means that the Suns can kick up the pace with their bench. You have two stark choices against the Suns: defend against power or defend against speed. That's like being caught between Scylla and Charybdis.