Uncia,
Many of the guys you listed had a lot more interest and prospective talent at the time of their draft than what you're seeing now at the 7th spot. Some of those guys dropped due to draft day hype for other athletic talents, some just had trouble finding a team needing them. Amare and Bynum dropped due to questions about being too young. Hamilton didn't have the sexy athleticism to be a top five guy. Andre Miller had shown to be a solid, smart PG in college, but again was not top five due to a lack of the "sexy" factor.
I would say this draft lacks in both the solid and in the sexy, and many picks look like the sort of bench help of the mid to late half of previous drafts.
There are a lot of reasons why a player will fall in the draft, and it's always easy in hind-sight to say that 'it's obvious that he should have been taken earlier'.
For instance, remember how Joe Alexander jumped to the top of the draft during the offseason and was selected by Milwaukee with the 8th spot?
I remember reading the articles that summer about how he slept in the gym and always had a basketball in his hands. His perceived dedication to gain basketball skills combined with this athleticism caused Milwaukee to pick him, and of course we know he became a bust.
Well, in hindsight I can say that they made a mistake in selecting him that early, but at the time you just don't know.
How about Russell Westbrook being selected with the 4th pick in that same draft? He didn't get to play the PG spot due to Collison being there, and there were severe questions about his game. When OKC selected him, it was a huge reach at that point, and now, 3 years later he's an all-star.
Again, in hindsight, it's perfectly obvious that Miami or Minnesota should have selected Westbrook, even if that would have been a huge reach at the time, but you don't really know what's going to become of these players until they have a chance to either succeed or fail at working on their games.
And that's the point I'm making. You say that the draft lacks both solid and sexy picks, and many of the picks look like potential bench help. It's fine to say that, but the reality is that more than likely there will be some big-time players who are selected from the 7th spot forward. Players who had question marks, but over-came their weaknesses.
What would happen if Chris Singleton worked extensively on his game and became a 40%+ shooter from the 3-pt line? If I knew he was eventually going to take his shooting game to that sort of level, I'd select him with the 7th pick with-out hesitation. What if Jordan Hamilton really is the second coming of Paul Pierce (who's game he reminds me of), people would look back and wonder why Hamilton slipped all the way to 10+.
What if Kenneth Faried ends up being the second coming of the Worm, and helps fuel a team to multiple championships with his hustle, defense, and elite rebounding? Dennis Rodman was the 27th pick in his draft, I think that's good value at that spot.
After watching college basketball all season long, it's easy to look at some of these players and think how good they could be if they shore up some of their weaknesses. It will be up to Petrie to look hard at each of these guys, and select the one who has the best chance of dominating at what they are good at while working hard to fill in the holes of their game.
Hindsight is easy to work with, it's trying to project how a player will respond in regards to working on their game and acomplishing their goals that can be difficult, but I can almost guarantee that their will be some player out there who will 'prove everyone wrong' and end up being a major player. Hopefully that player will be selected by Petrie.