In what way? Below is a list of #2 picks since 2005 (excluded this year). On this list the only ones you can say definitely have been better/had a better career than him thus far are Durant, Dipo, and LMA. Let's not forget that Dipo didn't hit his stride until last year. You can argue MKG and Jabari have been better maybe, I would say you are wrong though.
#2 picks routinely don't pan out, at all. Look how many of these guys below were absolute . The kid is only in his 4th year and is playing pretty well imo.
2017 Lonzo Ball, UCLA – Los Angeles Lakers
2016 Brandon Ingram, Duke – Los Angeles Lakers
2015 D’Angelo Russell, Ohio State – Los Angeles Lakers
2014 Jabari Parker, Duke – Milwaukee Bucks
2013 Victor Oladipo, Indiana – Orlando Magic
2012 Michael Kidd-Gilchrist, Kentucky – Charlotte Bobcats
2011 Derrick Williams, Arizona – Minnesota Timberwolves
2010 Evan Turner, Ohio State – Philadelphia 76ers
2000’s
2009 Hasheem Thabeet, Connecticut – Memphis Grizzlies
2008 Michael Beasley, Kansas State – Miami HEAT
2007 Kevin Durant, Texas – Seattle Supersonics
2006 LaMarcus Aldridge, Texas – Chicago Bulls (Draft rights traded to Portland Trail Blazers)
2005 Marvin Williams, North Carolina – Atlanta Hawks