Tasteless.
Before I comment on the game, I must say that your general tone is pretty unprofessional. I understand that you don't want a low score, but I think the point of writing these reviews is to point out the flaws and strengths of the flash. I kinda lost it when you asked for us to vote 5 if we liked the song (which I didn't), that was just...... ah, my vocabulary fails me now.
Anyway, back to the game. I said it was tasteless because I fail to see the humor in beating the crap out of Bieber anymore, it's way overdone by this point. I bet some people still find it hilarious, but the only reason I have to hate him is because people won't shut up about him.
As for the game, it was kinda bland. I was expecting a tutorial, so I started playing without realizing what the controls were. I guess that's excusable on my part though. But some of the stages were just awful. The stage where he is in a car kicked my rear multiple times, until I went back to the menu and saw that you could tap space to increase speed (and I personally think that space was a bad key to use, but that's just personal preference and will not cloud my judgement). The stage with the music leaves little room for error, and I found it infuriating when I literally ran out of time right when the music ended. Instead of the penalty system, there should be just a set number of penalties that if you reach that number, the level is instantly failed (I don't watch football/soccer, so I'm not so sure how the rules work).
And why do I still have to attack him at the end of the tank level? Isn't it enough that I blew up his tank? I was caught off guard by this and got hit, forcing me to repeat the stage. AGAIN. I eventually gave up on that stage, it was just too tedious and difficult to try and assemble the tank when I knew full-well that by the time I destroy his, I'd be out of time since I'm too slow to efficiently dodge his soccer balls and him trying to rum me over. The difficulty of this game needs to be addressed in my opinion. At this point, it's just average in quality and level design.