I think you're finding examples of all the low class hoes around and blaming them on 'imports'.
Like I said, the majority of girls from back home are way better than the besharam ABCD's. No clubbing, booze, sex, attitude, big mouth, no lack of respect for elders and parents etc...at least not with the girls from back home who come from GOOD families.
However, agar Pakistan sey bhi app kisse aissi taissi ko ley aein gey then she may be dicey to say the least....however I have found that people from good families have much better luck in identifying good girls for their sons from Pakistan...because they know what to look for, and they dont pretend to be something they are not...they are well off and well respected to begin with and as such have no need to try and impress anybody.
And you're wrong when you say the trend of bringing girls from back home is decreasing. Good families like the Syeds, Shahs, Jumani's, Khattak's, Malik's etc all travel to Pakistan to find girls for their sons. And those people are very happy with their partners Mashallah.
If you marry to climb the social ladder, or if your own family is suspect then you have more chances of ending up with the girls you mentioned.
Anyway, I wish you the best in your ABCD search. Allah aap ka bhi bhala karey !