It drives me nuts when people spend more time arguing semantics over terminology than actually doing the damned thing.
Seriously, people, get a hobby.
On the pronunciation thing, it's as simple as this: I'm an American who speaks with a Midwest American accent, and will pronounce any word in that fashion. I'd expect anyone from anywhere speaking any language to pronounce foreign words in their own accent, perhaps making efforts or adjustments for the sake of bridging communication barriers. You should expect the same from me.
The English language especially, but really any language, has adopted and/or adapted countless foreign words for their own cultural purposes, including saying them in their own native way.