Adequate, but not impressive
The animation was fine, but I had a problem with some of the text boxes.
The first thing shadow said was very long and it distracted attention from my views. Eventually enough of those made me lose my focus of the sprite video.
For a sprite movie, it wasn't that bad, comparing how much other sprite crap we receive here at newgrounds.
The Gradient textboxes, you know where it has like different colors all joined together like a rainbow, if not used well, it can also look cheap.
Also I had a little error near the end where the "Big Boss" said he could use it for his own purpose, there was no way to get around that unless you right clicked and "Forward" it, else it would go back to Eggman talking about Metal Sonic's power level.
In short:
Animation: above average
Graphics:... Its sprites?
Sound: Not a problem here
Music: Same as Sound
Language+speech: needs work.
I've changed this to 5/10 Stars
and 3/5 Rating.