Is he that good?
I'm not sure if his skills will translate well to the (much more physical/athletical) NBA, but he was pretty great in Euroleague last season. If I recall correctly he had (by far) the highest PIR (Performance Index Rating).
Could completely flop, could be a useful bench player and there's also a (very slim) chance he might adapt properly and become a great player. Definitely a nice bargain. Not that I watch too much Euroleague though.