Funny but I didn't compare it to a 12xDVD in my post. The transfer speed of BR is extremely low relative to it's available space.
Well the BR "advantage" obviously relates to PS3's BR drive so there is a comparision, otherwise it's not an "advantage" (compared to what?).
And what about the rest of your post, low memory bandwidth? Does a BR drive have low memory bandwidht?
Anyways, since we have the same memory footprint to fill (512MB) the transfer speed in relation to the available space is not a disadvantage.