5. The San Francisco Giants
Projected rotation: Madison Bumgarner, Johnny Cueto, Jeff Samardzija, Jake Peavy, Matt Cain
The San Francisco Giants are much improved coming into 2016. They added two solid starting pitchers in Johnny Cueto and Jeff Samardzija via free agency, to an already bolstered starting rotation.
Madison Bumgarner is a legitimate ace in the big leagues, and a true front of the line starting pitcher. In 2015, Bumgarner went 18-9 with a 2.93 ERA, at the young age of 26.
Cueto and Samardzija are two guys that have a good amount of experience as well as success in the big league, and will be effective in their respective roles in the Giants rotation. In addition they are both younger pitchers in the prime of their careers.
The big reason the Giants have a top five rotation is because they have a lot of experience, and established Major League pitchers. Nothing is better in baseball than established Major League talent, and the Giants have that.