Typically callups can look amazing for <10 games, after that they regress a bit and that's when you can see where they're really at development wise. No reason to hype him up just yet really.
I was cautiously optimistic, heavy on the caution, but reserving judgement. But last night was impressive because Nesterov made a pretty ridiculously bad play and then went on with the game as if nothing happened. Gotta like that poise, particularly in a player who's not really supposed to be here right now.