My thoughts as well, still upsetting for a top 10 pick. Also a long way from "I don't see why I can't be rookie of the year" but oh well, he's potentially the future of our team so let's pray it pans out.
I'm not worried. I said on draft night he might not even crack the rotation until near the end of his rookie season. This is not unusual at all for a 10th pick in the draft. Most lottery picks get significant playing time simply because they are drafted by crappy teams. When a lottery pick ends up on a playoff team via trade, he usually gets less PT as a rookie.
Hell, LaMarcus Aldridge was picked 2nd in the draft, but didn't start seeing regular minutes until after the trade deadline his rookie year - when the team finally stopped showcasing former all star Jamal Magloire. Aldridge was buried behind Magloire and Przybilla at center and Zach Randolph and Travis Outlaw at power forward.
C.J. was also a 1oth pick and a 4-year college player, but didn't become part of the regular rotation until the end of his second season when both Wes Matthews and Aron Afflallo were both injured.
Here are the #10 picks since 2010:
2010 - Paul George
2011 - Jimmer Freddette
2012 - Austin Rivers
2013 - C.J. McCollum
2014 - Elfrid Payton
2015 - Justice Winslow
2016 - Thon Maker
Not one of those players averaged in double figures as a rookie. Payton averaged the most points (8.9) and the most minutes. George was second in scoring at 7.4 ppg. He is clearly the best recent #10 pick, but did not crack the starting line up until March 9 of his rookie season. Rivers and Winslow both played big minutes as rookies, but only averaged 6.4 ad 6.2 ppg.
Expecting any #10 pick to have a significant impact as a rookie is unrealistic based on recent history. If you go back 20 years there have been some very good players selected at #10 (Joe Johnson, Jason Terry), but only a few have had a significant impact their rookie year (Paul Pierce, Brook Lopez).
Collins is young and inexperienced compared to most other #10 picks. If you set your expectations inline with the historical performance of #10 picks, I think you'll be a lot less disappointed.
BNM