So I know it's still so early in the season but the Nets look horrendous. And I know that people are saying that the Heat didn't look too good when they first started playing together (made the finals that year) but from watching Brooklyn the past couple games I realize that it's more than just chemistry issues. They're getting absolutely abused in transition, in pick n rolls, and the guards are just making awful decisions on offense (All of those things bring in to question Kidd's coaching abilities). Part of the problem is that Brook Lopez and Deron Williams are soft as baby crap. Garnett and Pierce need to be playing with guys who can be enforcers since at this stage in their careers their bodies can't handle being in that role.
I think you've answered your own question twice.
1 - Look at the Miami Heat, as you pointed out. Also look at how Garnett and Pierce have played in previous regular seasons and then stepped up their games to new levels in postseason play. You are not seeing the Nets best basketball right now. And the Nets are very aware of it.
2 - I don't see how you can attribute the softness of Deron Williams or Brook Lopez to Jason Kidd.