Well its totally wrong to judge Indian culture on the base of a show. And what is so serious in this? Its not like only Pavitra Rishta only show showing multiple marriages.
I don't remember how many times Prerna and anurag got married with different people in kasauti, But it doesnt mean Indian People follow them. I guess in Kyuki and Kahaani both husband raped his own wife doesn't mean all Indian husbands r following them. There was a Show Dill Mill Gayye where more than patient doctors were giving importance to romace that doesnt mean all Indian doctors r throwing patient in one corner and focusing on romance only.
Ovi and Purvi r not real sisters but i remember in Kasamh se 2 real sisters were pregnant with child of same man so does it mean all Indian sisters r made behind one guy?
Not only pavitra rishta but any show not reflecting Indian culture.