Boston did not tank. Tanking teams trade off all useful veterans for future considerations. Philadelphia tanked. Boston did not. If Boston would have tanked Rondo, Bass, and Humphries, at a minimum, would not have been on the team at the end of the year. Boston made a trade before the season started to pick up 3 first round picks for some aging veterans. Trading Lee just made good financial sense given his contract size and length and for what he provides. That is not tanking.
The criticism of Danny, Moranis, is that he tried to thread the needle and do both - get the high pick AND keep tradable assets. In the end, I think it backfired. We didn't get the top pick and we could easily lose Bayless and Humph (who helped us win games) to FA....
It's certainly possible that Danny has this all figured, but I think his job of getting Love would have been much easier with a top 4 pick.
The criticism is based on assumptions of Danny's motives and objectives that you don't know are accurate. Also, Danny's been saying all along that there aren't any great players in the draft, for all you know Minny agrees with him and getting Love wouldn't be terrifically easier with the 4th pick. In 2006 people were all over Danny for not ending up with a better pick than Minny. There were plenty of posts claiming that he had the 7th pick in a 6 player draft so his pick was worth much less than any of the picks above him. Four of those picks were Adam Morrison, Tyrus Thomas, Shelden Williams and Bargs. In retrospect, how sure do you think those people would be of those claims?
The criticism was based on predicted results that have so far come to fruition. Many believed that the team was heading toward a lottery disappointment, and that's what happened. Could Danny still make moves in spite of the disappointment? Or could the #6 pick have more value than many believe it to have? Sure, but for now it's frustrating for those who predicted this result.
As for looking retrospectively at the 2006 draft, that seems somewhat irrelevant. The question about the #6 is regarding the value of the pick, and that's not in any way illuminated by how Adam Morrison turned out as a player. Does how Greg Oden turned out mean that the #1 pick in 2007 wasn't incredibly valuable at draft time?
Also, you know who you can draft with the 4 pick in the draft? Anybody that might be drafted at 6. So, if Minny agrees with Danny and is not starstruck by the top 4 in the draft, the #4 pick at the very least could get them the player they might pick at 6 and also would give them the added value of any other team that might value those other players. Further, I'm not sure that Danny even agrees with Danny on this draft because he told Wyc that he LOVES 6 players in this draft...