I agree. I wouldn't give him less than Macca. I also thought Segy injected some much needed life into the attack when he came on. Turps made a couple of errors, sure. But so does everyone when they're busting their guts, out of position, and forced into a higher workload by a hooker who makes us constantly defend.
Turpin also played a full 80 minutes and made the same number of tackles as Flegler and one fewer than Glenn. He didn't have a great game, but he had an okay one.
That said, he's barely NRL standard at halfback and shouldn't be starting there.