QR discussions on pprune always end up like this - the 320 guys and the FO's on all fleets give the place an absolute slagging, then a few 777 DEC's stick their heads above the parapets and say its not actually that bad. Both camps are of course telling the truth as it relates to them. There is a massive difference in roster patterns, lifestyle and the way the company treats you, according to the fleet and the seat that you are in.
But considering there have been numerous cases of people being promised widebody commands in the interview and then finding out when they got to Doha they were actually going on the 320, or being told they were just going in this "temporary" flea pit of an apartment until their villa was ready, and two years later still waiting, is it really a risk you want to take even for the DEC job?