Die-by-the-3-pointer team? You really think so? Let's look at the six Suns losses, and see if 3-point shooting had anything to do with the loss:
Oct 31 at LA Lakers - 13-30, 3PM-A, 43.3%
Nov 3 vs. Utah Jazz - 9-31, 3PM-A, 29.0%
Nov 4 at LA Clippers - 11-27, 3PM-A, 40.7%
Nov 8 at San Antonio - 10-23, 3PM-A, 43.5%
Nov 9 vs. Dallas Mavs - 11-21, 3PM-A, 52.4%
Nov 18 at Utah - 7-18, 3PM-A, 38.9%
The Suns shot reasonably well from the 3-point line, apart from that first Jazz game. The reason why they lost all these games is because they had no defensive chemistry at the beginning of the season. They were still trying to integrate Amare, and it look a few weeks to do so successfully.
The Suns' two worst 3-point shooting performances occurred during dominant wins.
Dec 10 at Charlotte - 5-18, 3PM-A, 27.8%, Suns win 114-84
Dec 11 at Orlando - 4-16, 3PM-A, 25.0%, Suns win 103-89
Obviously, the Suns played pretty decent defense in these two games.
The Suns have developed a defensive chemistry and are winning over and over and over because of it. There have been a couple of nights on this win streak where their shot just wasn't falling, but they still managed to win handily. Furthermore, the Suns now have an inside and outside game--Amare Stoudemire is eating up the opposition, and Boris Diaw is becoming the aggressive point-center that he was late last season.
And lastly, the Suns have a point differential of 6.9 ppg, 2nd best in the league, 2nd only to the Spurs.