frankly I would favor the CJ2 without the fadec system as its a simpler airplane and has none of the CJ2+ irritations such as the need to reset the fadec with a laptop each time it fails which on some aircraft is quite often.
I agree the FADEC is not robust - but all the failures I have ever known are if the master-battery is flicked on (eg to check fuel) and then off again, before the FADEC has run through its boot cycle (about a minute) or else if, on shutdown, the master-battery is turned off before N2 has decayed completely to zero.
For me, the FADEC is a big boon - it reduces workload usefully, particularly on departure and initial climb.