If you meant able to watch Flash / Java anything on MS is just like having a MS system. Linux does not really care how MS sees the data. The Virtual Box fools the OS that is by itself providing the connection with the Hardware. So you can see, hear and move files via network.
The only "problem" is the one on the OS is a free version and the USB is disable, so you can not read thumb drives or media devices. Is not broken, just that you have to pay for the real version with all the bells and whistles.
The advantage is that you still installing from CD/DVD whatever you wish. Never tried a resource demanding application like a game, so I do not know for sure how far can I push it. I would assume is limited by the hardware running 2 OSs but other than that, runs great.
If you want MS games in Linux, get Cedega. Is a MS "emulator" geared for gaming.