I would also take some of the negative rumours about Qatar Airways with a large pinch of salt.
Sure, there are a lot of rules...is the UK or Europe any different? Will you get sacked for forgetting your hat once? No. The 'bottle of water' incident is well known out here and there is far more to that story than people will have you know.
Most interviews are conducted in Doha, but not all. It'll be a bit of a whistle-stop-tour, but you will get about a day to look around.
Training is generally far better than it used to be, and still on the up. There is a big backlog though and QR tends to bring guys (and gals) out here, put you in the queue, and then let you enjoy the pool for 6-8 weeks...while being paid!
Sure, the life is very different...but everything is what you make of it, and what your expectations are. I have family out here and they really enjoy it. Just do plenty of research and work out what is important to you before you decide.
Hope that helps.