Most people who know OAA or have been there generally praise it. Those who do not know OAA and have not been there generally knock it. You must weigh up all the odds and decide for yourself which is the best route to take. Whatever you do, becoming a pilot is not cheap.
From OAA site:
08 to date - RYR 39%, BA 13.6%
07 - RYR 22%, BA 16.6%
06 - RYR 3%, BA 16.3%
05 - RYR 1.1%, 19.2%
So plenty do still go to BA, just more to RYR at the moment, so don't put any BA ambitions on hold just yet. Ryanair have taken a large number of pilots form all areas over the past few years, not just from OAA. This is inevitable as RYR have expanded so fast. You would expect this to drop off if their expansion slows, but also everyone's recruitment might slow. Oh to be able to see into the future.
OAA has never just been a feeder for BA. OAA pilots have always gone to a variety of employers. Like any career, the key is getting that first job.
Best of luck for the future
Skintman