Vast majority of members of assemly chose Zardari as President of Pakistan and thats the only way a person can become president in pakistan’s constitution - unlike USA constitution where a president is directly elected..
There is no measurement or indicatorof how many people hate a person.. and a president can only be thrown out by impeachment..
It doesnt matter if Zardari has any good thing or not as its not a qualification to be president.. there is a clear process and he has gone thru it..