I don't by any means think he's the finished product, but he is so young and so far ahead in his development of other halves that I think he's going to get there.
Ages that halves locked down a spot - DCE (22), JT (22), Cronk (22), Reynolds (22), Cody Walker (26), Cleary (19), Luai (21), Moses (20), Nicho (25), Townsend (23), SJ (21), Foran (19), Keary (21), Hunt (20), Hughes (23), Munster (20).
He's also listed as 183cm and 78kg. This means he's taller than - JT, Cronk, C Walker, Reynolds, Cleary, Moses, Townsend, SJ, Foran, Keary, Hunt, and the same height as Hughes and DCE. There is no reason not to expect that he can fill out the extra 5kg or so to match many of their playing weights.
At this stage, I'd agree he came in as a bit of a one trick pony with the harbour bridge pass, and his kicking has been uninspiring. But he has been an 'average' nrl half at the time that many other good halves were playing cup or flegg. He's got 50 games under his belt, and definitely needs to work on some aspects. But I expect that he will go on to have a very good - great NRL career.
Whilst I agree with our stocks, we definitely don't need to go out and spend big on a half, especially one that isn't a finished product. If he was being shopped around and we could get him cheap, I'd be all over it. I think in 2 years he will be a star.