I've met plenty of guys who married bar girls and it worked out fine. Lived happy ever after.
I've also met quite a few less than attractive guys who got taken to the cleaners , lost lots of money and then become mysogynists, hating ALL Thai women.
Same back in the UK with guys marrying English roses. Sometimes a life long partnership sometimes an acrimonious divorce with both parties bickering over every stick and stone. If kids are involved the women usually come out better.