All new FOs at my employer are cadets, not experienced - they stopped taking experienced FOs a fair way back. The bulk of the Brits are OAA, and to be fair the vast majority are very well adjusted.
There are also cadets from other countries, one Nor-Nor-West country which seems to specialise in producing very young, extremely arrogant kids, many of which are untrainable, arguing with TREs and LTCs alike. These are the ones who turn up scruffy, spend too much briefing time strutting in the terminal and too much turn-round time posing to embarking pax and chatting up the cabin crew. They are also prone to bringing in Go-Pro type cameras for their YouTube and Facebook videos, thinking that they are pin-up stars. They are typical products of that nation, but even from there we do see some that are very good to work with.
Cadets don't seem any better or worse on average than the experienced FOs I saw in other companies, as long as they have a good attitude. Where the difference lies is in how experienced FOs who have worked their way up have usually had enough experience to knock any attitude problems out of them and be more mature about their behaviour than the gobby minority of cadets.
Still, while average quality seems to have dropped little, TRSS and P2F will exclude many better candidates just because they can't afford to subsidise the industry.