To get a refund anywhere, you will need to argue that Egosoft held back all real information by e.g. actively disallowing any sorts of neutral reviews while intentionally spreading wrong information and lies. This results in a customer having been "mislead" prior to purchasing while not having had a chance to know what he buys - which in most countries and even steam is an exceptional reason to get a refund due to the product having been lied about in key features.
The key information lies in this interview:
http://www.escapistmagazine.com/news/view/129117-Egosoft-Boss-X-Rebirth-Reboot-Sheds-Limitations-of-Legacy
And this is the relevant quote:
Any fan of space simulations will find the UI in X Rebirth easy to use and much more intuitive, but the 'Trade, Fight, Build, Think' gameplay elements and interaction remain as deep as X game fans have come to expect.
- "Bernd"
- "Bernd"
Since none of the above is true to any extent while Egosoft refused to allow neutral reviews of any type, everyone is be entitled to get a refund. Also pointing at a plethora of reviews and complaints everywhere is helpful to back your case.
The shop might try to refuse anyways, but you might just threaten with undesired publicity for that shop or even a lawsuite 'cause it's your very right to get your money back if you have been lied to.
Also I added a poll for those who like to share how it worked for them.
Hope this helps !