Military defeat, foreign occupation, civil war, and famine were just some of the direct consequences of Mussolini's decision to enter the Second World War. Infringement of civil liberties, elimination of freedom of the press, elimination of worker unions, and deportation of Italian citizens of Jewish faith to concentration camps were some others.

Less direct consequences of his policies include strengthening of private consortiums and monopolies to the detriment of workers and consumers, stunted social and economic development, and political and economic isolation.

u/Klesk_vs_Xaero is an expert on all things tied to the Italian dictatorship. They may or may get around to answering this question (and another user might very well offer an answer too), however in the meantime I can point you to this fantastic and very fair write up of the dictator's qualities, as well as this more recent write up on reading material to dive deeper on the Italian dictator.