Although they sound fancy and sophisticated, their overuse will actually create weak and pretentious sentences.
Dragoman prefers avoiding nominalizations wherever possible.
Weak: We will have to make a decision by 10 p.m. tomorrow.
Stronger: We will have to decide by 10 p.m. tomorrow.
Stronger: The world leaders will discuss the Syrian refugee crisis at the summit.
You can read further on ways to avoid nominalization here.