A lot of people didn't like the dream sequences, but I thought they were the most accurate as to how dreams really are.
In most shows they portray dreams as straightforward and logical, when in reality dreams are bizarre and jump all over the place at times and people say and do weird shyt that seems normal.
The dreams were pivotal to the arc of the season. The dreams was Tony's subconscious shouting at him to see a danger he was ignoring.