I've seen this criticism pop up regularly over the years, so I think it bears addressing. At the time of that draft, I shared your view that the Celtics should be aiming for moonshots rather than solid value picks that lacked super star upside. (Although, I've always liked Olynyk, so I was perfectly happy with this particular pick, but that's not really relevant to my commentary here.) But, events since then should push us to reevaluate whether we were correct. Because, I can't speak for you, but my belief that we needed a moonshot type pick was premised on the belief that the Celtics best case for the next several years was being a mediocrity, fighting to get into the back of the playoffs. As such, good solid players weren't what we needed, we needed a new star or two to lead the team.
I was wrong. Ainge was in the process of rapidly rebuilding the Celtics into a team that, a few years later, is competing for a 1 seed with several recent draft picks playing important roles on the roster as the solid rotation players he drafted them to be. As a result, it's really hard to, with the benefit of hindsight, continue to look back on these decisions as having been misguided. Because, sure, we could've drafted Giannis. But, we also could've drafted a high upside guy who busted with that pick. And, at the end of the day, Ainge's overall strategy appears to be working quite well, so maybe we shouldn't dwell so much on what he could've done better. Because, what he actually has done, both in the draft, in FA, and via trades, is pretty amazing already and is still getting better.