I look at assets from 1-8.
8 is superstar value
7 is an exceptionally value
6 is very valuable
5 is above average
4 is an average
3 is below average
2 is a throw in
1 is a player to be named later.

So I don't think it's useful just to rank them. It's a matter of what the value of each asset really is. So here's my take.
17 Net 7.2 - a #1 pick would normally be a 7 but right now this draft looks better than average.
18 Net 6.5 - everyone knows this will also be quite a high pick
Brown 6.5 - He's showing more every month and this could be a 7.5 by this time next year
Crowder 6 - 26 years old, flirting with 50/40/90, great defense and one of the best contracts in the NBA make this one of the most valuable non-star players in the league
Smart 5.5 - Opposing fans hate him. Opposing coaches would love to have him. He's proven that this year he can run a team.
AB 5 - Only because his contract is coming up. Remember how many people thought Danny overpaid for him? HAHAHAHA
Zizic 5 - Starting to look like a steal
Olynyk 4 - Could fit in with any team with his shooting and rebounding off the bench
2019 Memphis 4 - This pick may just get better
Yab 3.5 - Only because he's unable to raise his value. Still, he's dominating his league.
Rozier 3 - If Terry can get his 3 point shooting up then his value will substantially increase
2018 Celtics 3 - picks in the 20s aren't that valuable.
2019 Celtics 2.5 - ditto