Once you are trained and flying, BA is still a pretty good airline to work for. There are things that need to be addressed, particularly at LGW. Pay, transfers and duty hours to name a few.
I would say that perhaps the job itself is in decline across the industry. Pays are being cut, terms and conditions eroded, etc. People do it, for various reasons, despite they way the airline is steered.
If you can tell me a better airline to work for in the UK, I would give it serious consideration. Other than that, BA, for all it's problems is still the airline for me.
For those that are in the various holding pools, just hang in there. This is not the first or the last time the company have used holding pools. I waited two years for a start date. It sucked at the time but it was worth it in the end.