I think the Media is part to blame for the fans reaction to Jaylen Brown. If you go back to the tape of Jaylen getting drafted, the ESPN analyzers went on and on about Danny trading the pick. They made it seem like a given that a trade was imminent. A backlash resulted when no trade happened. Jaylen is going to be a great player, he has nearly identical stats in the first year of college as Pierce.
Jaylen Brown clearly was not the best player available when he was drafted. Boston fans aren't stupid as some people think. That is where the disappointment came from. But mostly I feel the fans really wanted a trade for that pick more than anything. With all the trade rumors surrounding Jahil Okafor and Nerlens to the Celtics, a lot of fans I think love the idea. Not only did it not happen, number 3 pick was blown on a guy clearly not the best player available.
Dragon Bender - unknown kid that could not crack rotation in a lesser league.
Murray - decent shooter in college, FT shooting a bit low, predictor that he will not be as good of a shooter in the NBA. Defense non existent.
Dunn - 22 year old with reoccurring injury issues. Seemingly a decent PG - I for one think Isaiah is better.
Hield - lights out shooter, decent athlete. Rather predictable offensive game, has two or three offensive moves that made him successful in college.
Brown - outstanding athlete, and defender. Can get to the hoop, something our team desperately needs. Played in a questionable system with players that did not complement his game. Often triple teamed.
From what I see, Brown is the most well rounded prospect, and proved to be a good shooter in all the workouts with various teams.