I agree that Holmes will probably (almost definitely) be a better all-round fullback. But Barba is still a bloody good player and definitely in the top ten fullbacks. He's also got great utility value.
Well....If i was picking id rather all of these guys personally
Boyd,Dugan,Hayne,Wighton,RTS,Moylan, Tedesco, turbo tom, Inglis, Munster, Slater.
Id put him on par with Coote thou if it was for our club id chose Coote ahead.
At this stage he is better then
Hoppa, French, Gagai, Gordon,latrel mitchel.
And of course there is Holmes and Ponga lolohea and DWZ morris who i wont consider thou would make good fullbacks