My brother is currently living and working in Doha - he reckons it's a sh*thole.
In all seriousness though, these opportunities don't come up all that often so you should take them when they do. I moved to Sheffield for work in 2004 initially for a year, and I'm still here. Not quite as adventurous as Qatar admittedly, but so many things that I take for granted in my life now are all as a result of making that decision