I play D in BAP and I've allways had a bit of a problem with the camera. I used to play with it High (behind me) but if I, for example, was skating up the left wing, I couldn't see if a team mate was open to the right of me.
So I tried to play with the camera in classic mode but when the puck was in the offensive zone, I couldn't see if an opposing player was behind me waiting at the red line (a big problem in online team matches).
However, I found there is a solution to the problem. You can swith, during matches, between locking the camera to the action or to your player. This is done with the SELECT button on the PS3 and the Back button on the 360. So if the puck is in the offensive zone and you lock the camera to your player; you will no longer see the puck if you skate back and enter the defensive zone (but a red marker representing the horizontal position of the puck handler); lock the camera to the action and you won't see your player (but a red marker representing you).
I usually switch to player lock when defending (or trailing an opponent) and to action lock when attacking.

The camera lock only works in BAP-mode and it doesn't work when you set the camera to High or Low.