You are misremembering if you don't think the Wizards were planning on giving Wall a max extension (edit for clarity: or matching any offer that would pry him away from the team obviously they would pay him less if they could.) from day one. The only thing that could have railroaded that would be injuries -- the same thing for Irving and Davis, actually.
The 2013 NBA Draft did not have a single player of that caliber. That is inarguable for any reason beyond simply being contrarian.
Maybe I am misremembering, but what I remember is a lot of folks being down on John Wall after his sophomore season and saying that he hadn't proven himself worthy of a max contract.
Of course the scenario is a bit different between John Wall and someone like Giannis Antetokounmpo. Wall was a number one pick by Washington, and they had a lot invested in him from day one. He was absolutely supposed to be the future of the franchise.
Milwaukee has a bit more leeway with Giannis. He was picked seventeenth, and now they have added Jabari as their franchise player. Could Giannis end up better than both Parker and Wall in the long run?
I think so. But, based on their respective draft positions and the hype coming in, the Bucks don't have quite as much invested in that happening.
Anyway, I don't think the 2013 draft class will end up being a "weak" draft in the long run, and I think it's a bit early to say for sure either way at this stage.