Suggestions by @crepuscularcorpse

Josh Holloway

as Armitage in Neuromancer

Score: +3

Josh Hartnett

as Henry Dorsett Case in Neuromancer

Score: -1

Rob Lowe

as John Marcone in The Dresden Files

Score: -3

Jim Sturgess

as Harry Dresden in The Dresden Files

Score: -11

Tobey Maguire

as Mark Watney in The Martian (recast)

Score: +1

Naveen Andrews

as Vincent Capoor in The Martian (recast)

Score: +1

Hannibal Buress

as Lude in House of Leaves

Score: +2

Jimmy Fallon

as Larry Fowler in The Dresden Files

Score: +1

Steven Strait

as Lloyd Slate - Winter Knight in The Dresden Files

Score: -2

Jamie Campbell Bower

as Peter Riviera in Neuromancer

Score: +1

Tom Cruise

as Armitage in Neuromancer

Score: -4

Aaron Paul

as Henry Dorsett Case in Neuromancer

Score: +1