Audio has been disappointing and doesn't set the tone for the maps. The weapon sounds are ok, but very cookie-cutter.
Destruction is non-existent due to last-gen console support. It was too much and they were required to include last-gen consoles in the game, which restricted a lot of what they could do.
Hazard Zone was the game. Everything, including the Specialists, were built around that concept. Even the original maps were. Once they tried to shift to a true BF game, it failed.
The only hope is that in the next title, they won't support last gen consoles so they can incorporate better special effects.