Who are those experts? When elections were conducted everyone (local politicians and international media, election observers) had agreed that elections were fair and non-engineered.
Do you believe these liars and jokers?
All big news channels showed video clips of mass rigging. If you ask people of Karachi they will tell you what MQM did, they maintained their traditions of casting fake votes, even school children cast votes. Rigging was reported throughout the country, but it wasn't discussed because people wanted to get rid of military dictatorship. Politicians remained silent as they had advantage of that. Well, it was not new this time, the democracy system in Pakistan has always been unfair and filthy.