I see that Collison's not considered much here as the 23rd pick--I wouldn't consider him much either. He's probably a reach at #23, but would be a solid pick at #31--his talent level is probably better suited there. I'm lukewarm on him--I actually liked him better in his sophomore year when he was still considered an up-and-comer, because he actually did two things really well then: pass and steal the ball really well. I generally like those marks the most out of point guards, because they show leadership and a typical point guard athletic marker, but since then those numbers have regressed (his assists/poss dropped from 0.48 to 0.38, assists per 40 dropped from 7.1 to 6.1, and his steals per 40 dropped from 2.8 to 2.1). In fact, it probably would've been wiser for Collison to enter the draft in his sophomore year to capitalize on his rising play--I really get the feeling that he stayed in college too long, because his numbers are relatively stayed the same.
Collison has a very low usage rate for a point guard, which suits him well as he could easily make the transition to role player in the NBA, but he's highly efficient with his possessions. He likes to shoot the ball with those few possessions, and is a pretty good bargain for success with his 62% TS--he's a high percentage shooter from everywhere (in particular he's one of the best point guards in hitting two pointers) and that's a fact substantiated by his body of work in college--he's had a true shooting percentage of 60%+ in his last three years of college. He prefers to slash more than shoot three pointers though--he's surprisingly solid at getting to the line, and doesn't have a great sample space of three pointers. However, there are major concerns--he's too slight of frame and small to finish among the trees in the NBA, and he has a slow, strange release on his jumper, so despite all his success shooting the ball at college, that's why scouts question his ability to score in the NBA. I think he's smart and heady enough to overcome that, as shown in his college shooting, and eventually prove to be serviceable offensively though.
Collison still cuts it as a solid playmaker--his assists/FG~possession and assist/turnover are solid, but compared to his past success there, just not as prominent. His quickness athletic marker is most reflected in steals--he's a good stealer, again, but he's lost some here from his past success. So while Collison a low-usage high-efficiency player who proved that he can shoot the ball and pass/steal the ball pretty well, when you take into account the potential lack of success his scoring might have in the NBA, as well as his decreased assists/steals, the intrigue is drastically lessened. He's still a solid roleplayer, I would imagine in a richer man's Jacque Vaughn mold, or maybe a poor man's Chris Duhon--I think he's more of a college player than NBA player, but his talent level is better served at the end of the first round with all the questions that he raises. So not a good pick at #23 with better options available, but he could be a solid pick at #31 depending on if we need a point guard--he plays defense and passes the ball well enough, so he could be a bargain there.