I have been reading posts on this forum for sometime now.
Although , by all means, public forum provides very limited information to make general assessments... nevertheless, it is my observation that:
A) CIC works efficiently and fairly on FSW cases
B) Mistakes can happen - no office in the world can ever be 100% flawless
C) When mistakes happen ( NER's or obviously erroneous rejections ), CIC takes rather applicant friendly and caring stance and gives you a chance to resubmit your application with supporting evidence to overcome initial negative decision.
Best of luck,
Canada0801