Yes. I like the look of him.
Good physical talent. Solid quickness laterally and end to end. Good strength and solid body size for an NBA PF. He has the physical talent to become a useful defender down the road. Good skill level. He can shoot the three. He can fake the shot and line drive. He can run the floor in transition. That is enough ways to score to be a valuable role player.
Today, Yabu is a minus defender - even for a bench player. If I had to defend a series of plays, I would (much) rather have Hassan Martin. He gives away nothing in strength or size to Yabu, but has quicker feet and better anticipation, and he's much faster off the floor. Martin can't shoot from distance, but he knows how to put the ball in if he gets an offensive rebound or catches a pass a few feet from the basket - where Yabu struggles.
Martin is also going to make about $2.6 million less - which (if Smart signs for more than the QO) might be the difference between staying under the luxury tax line one more year and going over. Putting off the repeater tax is worth a lot - it's likely going to cost tens of millions when it hits, which could be just as Tatum needs his second contract. I'd like to keep the core together. I suppose if Smart signs for the QO it might not matter, but it would be a shame to pay the lux tax this year because we're hoping that Yabu will someday find his game.
Here is one more point of comparison - this year, Yabu is going to be paid twice as much as Daniel Theis, even though Theis is at least twice the player.