I don't know if it's also because a lot of staff wrote on...

I don't know if it's also because a lot of staff wrote on Glassdoor that it's not a great company to work for and after some bad reviews a bunch of 5 star reviews littered the page pushing all the bad ones away. The bad ones exposed some of the companies practices and said that their competition was catching up because NEA wasn't using their momentum to innovate.
Most negative reviews say the CEO is a problem and since, the reviews have complimented that the CEO is awesome. Someone has even suggested that the reviews were made up to lower the share price for entry.