firstly yes other pakistanis do marry ther 1st cousins, i know a few people in my real life and i have recently come across some1 on GS who was goin back to pak to get married and anyways if it is accepted in islam who are we to question it.
secondly yes i do think mirpuris are maligned, if u actually get to know a true mirpuri you will realise that they are nice humble people.
btw wikipedia is written by any1 with internet access, so its not really a good source.