ATCOJ30, I think your concerns are valid. We have F/O 's with 200 hours, captains with less broad experience and less total experience than in the past. I also think it's a shame that NATS stopped providing flying experience for controllers. When I started flying, a lot of controllers were ex military crew or ATC.
Don't authorise what you're not happy with, if you have concerns, state them, bluntly. I'm less enthusiastic about, for example, a controller ordering a go-around because he thinks the approach is unstable. Again, I'd rather just have it pointed out to me.