Are you really sure that you do not know it and are just burning because of a political bias? I tell you a few things and then you please enlighten me what Mani or others did.
1. Pakistan became number 1 test team
2. Pakistan was number 1 T20 team for a considerable period of time
3. Pakistan won a world event after decades
4. Cricket started coming back home
5. Pakistan fought for its best in the big3 issue and instead of being sidelined, got its due share
6. PSL not just became a reality but became the only brand of Pakistan in the whole world in last 50/60 years
Rest of the stuff is also known to you all but I will spare it for now. I might also have political differences with him on certain issues but where it is due, one should give it to him.
He had zero role in most of the things you mentioned. Was he selecting the team? mentoring the team? coaching the team? how was he making them win? that's not the work of the chairman PCB.
Pakistan has always been winning on and off. The champions trophy final just happened to be during that time. What exactly was his role in it?
Do yourself a favor and check the overall stats during his tenure, it wasn't any different than present.