I don't doubt that tomuchwork had a shocking time in QR, but their opinion is now dated. Only the folks that are at the coal face can give you any constructive feedback. Although I left recently to return back to Blighty for the kids, I loved my time in Qatar, if you intend to come then do your research, if married, take your wife for a few days (preferably in Summer!)................remember I am not there any more so my opinion is nearly as worthless (I left this year)
There are plenty of things wrong with Qatar and QR, make sure you know what they are and whether you can put up with them. If you decide to have an adventure then make sure you intend to make the most of it. There are lots of things to do and places around the globe to visit, I also personally saved a lot of money there although I was seriously helped by the Brexit vote and consequential effect on the exchange rate.