My WAR calculation is a combination of Baseball-reference and Clay Davenport; I believe it to be the "best" WAR number available for historical comparison. 8 WAR is an MVP quality season. The record is pythagorean adjusted for 162 games.
2016 (90-72)
C Buster Posey 5.6
1B Brandon Belt 4.85
2B Joe Panik 1.65
SS Brandon Crawford 4.15
3B Matt Duffy 1.1
LF Angel Pagan 2.3
CF Denard Span .65
RF Hunter Pence 2.3
OF Gregor Blanco -.75
3B Conor Gillaspie .85
3B Eduardo Nunez 1
C Trevor Brown -.1
OF Jarrett Parker .45
OF Mac Williamson .45
2B Kelby Tomlinson .6
SP Madison Bumgarner 6.25
SP Johnny Cueto 5.9
SP Jeff Samardzija 2.85
SP Jake Peavy -1.1
RP Derek Law 1.95
RP Hunter Strickland 1.4
RP Santiago Casilla 1.25 (13.75) Last season
-One of the best teams in the first half, one of the worst in the second, it all came out on the wash as the Giants made (and won) the Wild Card game and then lost the NLDS in four games to the Cubs. With a 90 win pythag+postseason appearance this is the 14th best regular season club in San Francisco history. Bumgarner cracks 30 career WAR, Posey nears 40. Giants say goodbye to Pagan, Blanco and the three remaining relievers with 3 World Series rings (Casilla/Romo/Lopez). Starting third baseman Matt Duffy is also gone, dealt at mid-season for Matt Moore.