I don't think Rubtsov is being overhyped, the problem is until he spends a year in the KHL, it's hard to get a read on how good he can be.
Lindblom is much easier, playing on a top line at age 19 in the SHL, and having improved his biggest flaw (skating), it's easy to project him as a real prospect.
I feel the same about most junior draftees, unless they were spectacular their pre-draft season (in which case they usually get drafted top ten), you really have to see how they play the first year after they're drafted, as the second year is when many marginal prospects make a jump because they're a year or two older than most junior players.
And college players usually don't really step out until their junior years, they rarely play much as freshman and are just getting a feel for the game as sophomores.