You can pull a bunch of youtubes on Wes Johnson to make him look like a great player. Bynum was not an ideal PnR player. He was best in the post and that still does not change the rest of my post. Pau was not a great fit due to defense and the fact that you could not maximize the offense with Bynum and Pau together (Think SPACING).
Nash was already a bad defender and Kobe was starting to lack in that area in 10-11 for one reason or another. So already 4 of the players in the starting lineup are poor to only avg defensively in the West where they had just got killed by Dallas. Getting D12 essentially made the Nash trade look worth it b/c D12 was a DPOY regular. Outside of that who knows how bad this team would been defensively.
No reason to even go into how bad the coach was at the time either...that was a given.