Porzingis is an invalid comparison for Bargnani, seriously, their effort levels are polar opposites.
It should be understood that Kristaps is first a defensive prospect, so the Dirk comparison is kind of sketchy with his 30% from 3 last season.
A few months after "Porzee" set the U18 Record for blocks in the tournament, he made the all NJIT team. In the 5 games during that tournament he shot 13/27(.481) from 3, Its realistic to think he will be a threat from 3 range is not an issue. (Heres a mix from that tournament)
https://www.youtube.com/watch?v=RAsAVUgRwI4
Last year he had his best game vs one of the ACB's best teams, Real Madrid. Interestingly enough his coach is the same one who had 16 year old Ricky Rubio on DKV Joventut, apparently the coach loves him and is comfortable giving such a young 7'er minutes operating on the perimeter.
Hes far from a finished product but due to his still developing SF skills and lack of strength, there's obviously a ton of untapped potential, he is very athletic too, very light on his feet and jumps/anticipates quickly.
Also i was only 18 when Bargs was drafted 1st but at the time i could've told you, that only a ****ing idiot would take him over Lamarcus Aldridge or Rudy Gay.