Which system are you talking about, Get your facts right and knowledge from the sources there is no system in Pakistan and running smoothly and improving is a huge question mark.
Well it is beyond your understanding but I will try to explain and give you two examples write form your own rotened system.
1: Since 1988 when Zia destroyed us with non party systems, we had about 5 assemblies with an average of two years per assembly. Lottas were biggest menace and were easily being manipulated by establishment. At the people literally chose two party system in the country.
2: Then we had two assemblies which completed their tenure of 5 years. The democratic process further flourished and Imran Khan emerged as publics democratic thoughts further developed.
Now if IK came up as a Nalaiq and useless mind than what can be done. Public is on its process for cleansing him out. Just get out on the street and see what Khulq-eKhudaa is saying about him. It is all democratic process and the evolution of democratic understanding of a nation.