He's 19 years old. Probably has the best defensive versatility of anyone in the top 10, and is probably the most athletic player in the top 10.
His shooting was poor in college, but he shot 40% from three in high school.
As Celtics18 said, I wouldn't be unhappy with any one of:
Hield
Bender
Brown
Murray
I like Kris Dunn but he don't wanna be here.
Brown like Hield, is an absolute workhorse and will work on his game relentlessly.
If Brown shot 35% from three he'd be fighting Bender for the consensus #3 pick.
Size, athleticism and IQ like Brown are a very rare combination. If the kid could shoot he'd go #1 in a lot of drafts.