Alright fellas, methinks this is on the verge of turning into another one of PPRuNe's famous bitch-&-moan sessions.
BH, your points are valid ones - but then so are MJB's. Experience counts, but lack of experience does not automatically rule out someone from being a competent pilot if they have received good quality training/guidance. The fact is, you weren't born with wings on, and you had to start at the bottom rung just like everyone else. Nevertheless, I'll assume you're a competent operator of your aircraft type, and you made the transition from piston to turbine just fine - otherwise you wouldn't be talking about it.
As I said before, if someone had absolutely no flying experience at all, a C172 would be just as challenging as a King Air and vice versa. It's not the aeroplane that makes the pilot, but the training he or she receives on it. If Qantas can train zero-time cadets through to a B747 and the RAAF can place the same into the front seat of a fast jet, a piston driver should be able to transition to a turbine. It's that simple. Experience simply means you've been doing the same thing for longer than the next guy.