Like any review site the reviews will always be either super positive or super negative, and with Glassdoor I think this natural effect is heightened because employment can be very emotional for people (versus a review of a burger on Yelp, for example).
For example, Hough says "There are concrete examples of how some startups have been seriously damaged thanks to their participation in startup incubators"... but she doesn't even list one example?
You need to focus on content marketing around your story - which, as I gather from your post, is the real estate opportunity in the middle east. Become an industry thought leader and champion.
Write some great blog posts that have real insight and just a very light sales pitch, and get them syndicated on sites that appeal to the middle eastern real estate and emerging business market. If it's a niche opportunity, which it seems like, then there should be several relevant niche media who, like you, are aiming for growth in the market, and can mutually benefit from great content you can provide them.
Basically, you need to identify partners who are vested in the industry's growth like you are, and figure out ways to be an asset to them and not just an advertiser. And the easiest way to do this is to provide great content.
