Almost as awful as OP.
Most NHL ready? That is a lie. Bob McKenzie said he would not be NHL ready, Hall was widely considered the most NHL ready.
Duchene would be a 3rd liner on Boston just because he is more rounded than Seguin, Tavares wouldn't have made the team his first year, Schenn and Hall are stupid to compare because they are totally different positions, and saying Hall is "laughably" and clearly better than Seguin is just wrong. Putting Fowler and Skinner as guys you would draft ahead of him is just as dumb. Is Sergei Samsonov laughably better than Thornton (Joe, to clarify)? No, not one bit. It's really not even close whatsoever. Take a look at their post-draft seasons, though. If the draft was redone today, I would STILL draft him first overall, as I would have back then, and I would have still kept him in the NHL with Boston for the simple reason that he is better served getting experience here than dicking around in the OHL.
I doubt Boston would deal Seguin for the 1st overall in this draft, any one from last draft other than possibly Hall, and I think you need to look at other 18 year olds in comparison before he's a bust. Look at Jason Spezza. I'm sure you would have thought he was destined to be a bust too. The last time a top team got a top prospect was Spezza to Ottawa, and just like Seguin he had trouble breaking in. That did not, however, preclude him from being a PPG player in his first 500 games.