The Entertainment of Movin' Google Images
I'll start by saying that this obviously entertained a lot of people, and that kind of focus is what most submitters should have on Newgrounds. I believe your claim about the tremendous amount of effort that went into your work; You did a very fine job putting all of this together, everything runs seamlessly.
However, nothing here was original. The sprites were taken off the world wide web, the audio was ripped from a commercial and most of the backgrounds were edited slightly from Halo screencaps.
Any average Joe who is reading this review could have achieved your vision with the right amount of time, I know that sounds harsh, but I cannot help but score you at a low level due to this fact. The quality severely deviates because of the lack of work YOU made with your bare hands (which does not include pasting and tweening).
The reason for the high score (4.45 at time of review) is shocking but understandable. Newgrounds has never been a negative critique of unoriginal sprite films. Those kind of animations are welcomed here, regardless of their status simply being stolen magic animated jigsaw puzzles. You merged the three things the Newgrounds community salivate over: Sprites, Halo and catchy commercial tunes. And tweening Google Images across the computer screen doesn't matter in a world like that.
Wishin' you well, and welcoming the useless review ratings :P