I know everyone is down on brown right now but lamelo is not arguably a better player than him (neither is garland). Lamelo is quite poor defensively and has had very questionable shot selection at times while playing for a lousy team.
I wouldn't hesitate for a second, if I could flip Brown for Lamelo. BTW, I think a lot of people over value Brown as a defensive player. As far as being a playmaker and having basketball instincts, the two are not even remotely close.
He hasn't shown he is deserving of all-defense teams, but in moments he is very good. We don't beat the Sixers without his defense on Harden. We don't make it to game 7 against the heat without his defense on Butler.
In spurts, he is excellent. I would prefer getting someone else that can reliably take shot creation responsibilities and moving Brown into the 3rd scorer role. I think he could be even more efficient (and he already is very good) working off of other people. From there, Brown should be able to focus on defense, and I think he could be an all-defensive type player.
The problem is Brown has the chance to be the highest paid player in the league, and your talking about relegating him to be a 3rd scorer role. If he was truly deserving of being a second team All NBA player, the Celtics wouldn't have needed 6 games to put away Atlanta, go to 7 games with Philadelphia, or ever being down 3-0 to Miami.
And BTW, this may be the worst home court team in playoff history. Something is wrong with this team, and it's on the players. I'm not putting this solely on Brown, but he is part of the problem, and consequently, his trade value can be part of the solution.