Ever since the freshman out of Kentucky, John Wall, was drafted, people find ways to down-play his skill set due to the numerous comparisons from NBA and ESPN scouts.
Wall has comparisons to him that have gone from Derrick Rose to even Magic Johnson, and with him breaking the assists record for a rookie in a month, people are starting to make predictions that he will break Mark Jackson's assist record for a rookie in a year (868).
The difference between Derrick Rose and John Wall right now in terms of their approach in basketball games is that Rose has the killer instinct that Wall hasn't developed yet. Wall is a pure PG and has definitely proven it this year as he looks for teammate often, and sometimes too often.
Right now, we can't really determine how good Wall will be, but we do know that he will be good; and if Steve Nash, who was always being criticized about his defense, can win back-to-back MVPs, I don't see why Wall can't do it once in his career.