If that role playing 4th pick ends up being the glue that improves the Kings to a perennial playoff team, it's absolutely worth it. Again, if you look at picks in a vacuum, sure, the 4th pick in a draft should be magnificent. That doesn't take into account available talent. Where would you draft Smith/Holmgren/BancheroMurray/Ivey in last year's draft? What about next year's? You play the hand you were dealt, and I think the Kings so far have shown that the right pick for them was made, regardless of expectations (by some) attached to the number in front of their draft position.
3 or 4 open threes gets you about 12 points. We're aware that it isn't 17. But Murray doesn't need plays drawn up to thrive, and he'll get other scores within the flow of the game. A layup here, a putback there, and all of a sudden you're in the neighborhood. Again, Murray is a good pick for what Sacramento needs, and he was the best choice given available talent. He has already shown, even in summer league, where guard play dominates, to be a heady player who can get points when it counts.
Let's look at the big picture. If he's a high level roleplayer, it means Fox and Sabonis are achieving at the level they need to for Sacramento to have success. He may never be a 30 ppg scorer, or have a 50 point outburst, but if he gets a solid 23-25, he's doing great things for Sacramento.