ouch! that’s a broad stroke to paint non-desi photographers with 
and remember, movie editing is very different from photo editing- perhaps their intention when editing the movie was to present our desi’ness differently or something.
lots of gora photographers have done a great job in capturing non-gora weddings, my own wedding photogs included.
have a look at a few great examples:
http://ashimagery.com/blog/wedding/ashi-umi-indian-wedding-philadelphia-wedding-photographer/
http://www.southasianbridemagazine.com/2010/06/real-wedding-sonejuhi-aaron.html
one of my favourite all-time photographers- Multi-Cultural Affair by Christian Oth Studios
(parts 2, 3, and 4 are just above the comments section of the page)
like you said, it comes down to the photographer and how skilled they are. and as it happens, price correlates very strongly with quality. this is not an area of your wedding you want to cheap out on.