Oman listed no. 17 for places for expats to live and work on the Expat Insider's 2017 Summary Report (I wonder if that's a drop from previous years or an up?). The top three countries for 2017 are 1. Bahrain, 2. Costa Rica, and 3. Mexico. That was a big jump for Bahrain's previous listing of 19th.
UAE is listed as 26th. Saudi Arabia is 61st. And poor Kuwait is on the bottom, in 64th place, along with Nigeria and Greece.
The rating system is apparently based on an ease of settling index, including be able to communicate, and career satisfaction, job security, work/life balance, and cost of living indexes.
See link here https://www.internations.org/expat-insider/2017/the-best-and-worst-places-for-expats-39182