why don't you list down the issues you have read about, and i can tell if i have any of them present in my GS150
Happy with my GS150.
yes you need to choose a bit carefully, as some have minor spots here and there, some will have loose taapas, some will have tail plastic not perfectly molded. all these are minor things, nothing serious. but do check about front brake carefully. most bikes front brakes are not perfectly aligned (brake shoes theek se baithay nahi hotay drum per), which causes less braking power. As this bike doesn't have disc, so front drum brake performance is very important for this bike.
as OP is from karachi, and want a big bike. honda isn't option for him. so my vote for GS150 here