From 2007 to 2012 Matt Cain racked up 26 bWAR, or about 4.3 bWAR per season. FanGraphs rates the same period 23 WAR, or 3.8 fWAR per season. I think we can safely say Matt Cain embodied the 4-WAR pitcher during that span. Roughly, a 5-WAR pitcher is an All-Star. Matty's 6.1 in 2009 was his bWAR peak, his 4.6 in 2011 was his fWAR peak.
Madison Bumgarner, from 2013 to 2017, was worth 16-18 WAR or about 4.0-4.5 per season.
Tim Lincecum's two Cy Young seasons, 2008 and 2009, are rated 7.8 and 7.4 bWAR and 7.