Let's start off with the basics.
In the 2009-10 season, Amar'e Stoudemire averaged: 23.1 PPG 8.9 RPG .6 SPG 1 BPG and 1.0 APG.
His career average is 21.4 PPG 8.9 RPG .9 SPG 1.4 BPG and 1.3 APG.
Now that that's said and done and you can refer back to it, let me try to show you why this was a bad move by both Amar'e and the Knicks.
Why This Trade is Bad for the Knicks
The Knicks wanted a top player to lead their team to at least the playoffs. Stoudemire is anything but.
If you look at those handy stats up there, you will see that his season average this year was worse than his career average. This means he's getting worse. The only thing he excelled in this year was his scoring and that is by less than a bucket.
The reason he can score in the 20s is that he had the league's best assist man (Steve Nash). Nash could dish it to Amar'e out of nowhere and Amar'e would get the easy dunk.
It's that simple. Without Nash Stoudemire's points will diminish quickly, or at least his FG percentage will.
If the Knicks do not get anybody else worthy of the title "All-Star," then Amar'e will be looked upon to lead the team. He will take those tough shots he never had to take before.
Everything was handed to him; sure he has talent, but it really blossomed when he was with Nash.
If the Knicks do get an All-Star, then his points will diminish as he won't get enough good feeds to him.
I don't care how good Tony Parker is, he's not Steve Nash!
The Knicks now signed a guy with All-Star money when they could have used it for either some other free agent this year, re-signing David Lee, or even saving it for next year when Carmelo Anthony said he would like to become a Knick.
Amar'e will not live up to the salary and become a new Elton Brand (well, maybe not as bad because it's hard to sink lower than the Elton Brand signing).
Why This Trade is Bad for Amar'e
Amar'e simply can't survive without Nash. Nash fed him the ball in his comfort zone and nobody has more assists than Nash did last season, hence why Amar'e improved his PPG.
The New York Knicks also will expect him to carry them which he simply cannot do. He will be exposed for his true talent and fans will not like him.
The last thing you want to do if you're any person is piss off fans of a team in one of the biggest cities in the world.
Not to mention the fact that one wonders why in the world he would leave Phoenix.
The Suns almost made it to the finals, got two wins against the Lakers, and Amar'e wants to leave? Jump ship when the ship isn't worth jumping?
LeBron has a reason to leave, Amar'e just wanted more money which will backfire on him.
When he is exposed for performing less than expected, (which will happen regardless as this is a glimmer of hope for desperate Knicks fans that expect him alone to take them to the playoffs) he will lose endorsements he had (or could have had) if he re-signed with the Suns.
Overall, this is a no-win situation.