Eh, could be better.
Not bad, but not great. A few things set me off:
First, you could have used some voice acting in the first scene. The speech bubbles were a tad amateurish and took away from the seriousness of the flash.
Secondly, it ended abruptly. He gave that speech and then it just ended. It made it seem more like a public service announcement than a serious flash. I think another scene would have been good to put in there, rapping everything up.
The backgrounds were pretty good, but the animation of the characters' walking sequences and the moving of the arm in the second seen could be improved on. Make the walking a little more subtle as to not make it appear that the character is marching through some sort of knee high mud. Less is more.
And, when the man was moving his arm during the speech, it looked like the arm was three separate pieces and had two elbows. Make the shoulder joint a little higher and make sure that when you're tweening the arm, that everything stays together and doesn't create gaps or breaks.
Overall it was an okay flash. With some improvement, it could be pretty good. Keep working on it.