I've been in the parts department for the past 7 years.
Sounds like you got a lemon! I've NEVER seen an Edge with even close to as many problems as yours.
I've seen the foglight casings turn to crap - but IMO, you can expect any plastic chrome piece on the front of any vehicle to wear out over time, due to stone chips etc.
All your other concerns seem to be things that aren't terribly common on the Edge - that I've seen, anyway.