What are the advantages and disadvantages of a dictatorship versus our current government with three branches?

In the UK not a lot. We are living 1984 now. Elected politicians don't represent the people, only what they would like which 99 per cent of the time is to their benefit. People don't matter. Fact of life over here is that the top echelon of govt. and the wealthy are all in cahoots to keep the populace under their thumb.