I think the top 8 players in the draft are in tiers all themselves. If I was on a team on the cusp of the top 8, I would try to trade up somehow.
Tier 1: Parker, Wiggins, Embiid
Tier 2: Exum, Randle, Smart, Gordon, Vonleh
I agree although I don't know enough about the international guys right behind this. But these are the only 8 that I can see being impact starters. The rest of the lottery is filled with solid role players who should really help teams but probably not what you are looking for in a lottery pick.
McDermott has bust written all over him. He didn't measure out that well and I'm just not sure who he guards. Best case is he becomes a 3 point specialist which isn't really worth a top 10 pick.
Hood should be solid but rather have Harris.
TJ Warren will likely be the steal of the draft assuming he falls far enough to get on a solid team. Guy can be the scorer on your 2nd team. Bigger question is whether he can be on the court for the end of games.