They advertise the spectate feature as being LIVE. However, we all fucking know 2 minutes is far from being live. Why can't they do it really live? "oh derp we advoid ghosting and cheating derp lol"
How about you take a look at HoN? Even though LoL > HoN imo, hon has some much more interesting features sometimes. Like the GPM counter and the spectate. You can "mentor" players too.
Seriously, im sure if I choose to spectate my friend i wouldnt care about the enemy team.