It's hard to rate "unicorns," Ratcliffe is showing a better scoring touch than expected, but his future probably is still a bit unknown, like Morin, you have to see whether he has the body control and lateral agility to make his size an asset as he fills out, or does he end up too "stiff" to handle smaller, more agile players.
You look at Chara and Wheeler and say, big men can have substantial advantages, but then you look at Boyle (#26) and Boris Valabik (#10 pick, 6'7 245) and realize that big guys, even when they're 1st rd picks, are high risk players.
The difference with Myers is while he's big, he's athletic enough that it shouldn't be a concern.