From my experience almost all the FOs at Jet2 are extremely competent, particularly the ex-apprentice guys and girls. What they lack in flying experience, they more than make up for in enthusiasm and receptiveness.
There's only been two truly questionable individuals who to be fair were not lacking in raw ability just with a work ethic too poor to get through a command course and to continue to be successful in that command (you're always learning). Those individuals were looking for pastures new in both BA and also overseas.
I've heard a few things about the way things were run previously with regards to the command selection and maybe there were some genuine gripes but it seems the company are now getting there with the new command development program.