Nothing could be further from my typical Statophile post than this one. I was more than a little frustrated by many in the Raptors fan base. The initial negative reaction to the pick of Jonas Valanciunas was based on less than stellar knowledge of the player.
Regardless of whether Valanciunas comes over or not, one thing will stay the same: The Raptors will suck. Be prepared for another year of losing and frustration, the good news is that the 2012 draft is already being compared to the 2003 draft.
This I can explain. His low usage rate when he is on the floor minimize his impact on team stats, such as team O/D rating and even plus minus (since that stat also accounts for the other members of the rotation. However, when he is being used, his individual stats, or the stats that are only dependant on his contributions, he looks pretty good, pretty great even.
Basically, like what everyone else has been saying, it comes down to usage rate. Involve him enough in the offense and there's no reason why his individual efficiency won't be reflected in the team stats.
Now here's where you might say "but the raptors lose more when he shoots more than average, so the usage rate argument doesn't hold up". That's a fair point, but I would argue that Jonas often gets those extra field goals when A) the guards are putting up a ton of bricks and Jonas is cleaning the glass, or B) he's a last resort after its clear that the other scoring options aren't working. In both scenarios, the team as a whole is playing below average, so it makes sense that they would win a lower percentage of games.