He moves the ball up the court, provides depth, still plays defense, is a playoff monster, etc.
It's a fine signing and I've long been the defender of Rondo. This offseason is done for the Lakers - they can't get Leonard because the Spurs are ******, there's no remaining star out there sans a hobbled Cousins. LBJ will just be a guy who carries the team, grooms the youngings, and next offseason is when the Lakers' squad goes ham.