As of this morning, the Cubs have the second best team ERA at 3.73. Most people will not realize how well the Cubs starters (with one exception) have been so far this season.
Wood is 3-2, 2.33 ERA, 0.928 WHIP
Villaneuva is 1-2, 2.85 ERA, 0.928 WHIP
Feldman is 3-3, 2.70 ERA, 1.118 WHIP
Samardzija is 1-4, 3.09 ERA, 1.168 WHIP
E. Jackson is 0-5, 6.39 ERA, 1.632 WHIP.
The starting rotation has pitched in 33 games. They have combined to throw 205.2 IP. This averages out to 6.1 IP/start. The starters combined ERA is 3.41. The starters record is 8-16. The team's record is 13-20. (The bullpen is 5-4).
The Cubs starters have only given up 78 ER. However, the team has allowed 93 runs to score during their time on the mound. The Cubs defense has given up 16% more runs due to poor play in the field.
The Cubs lack of offense and defensive lapses have overshadowed the stellar pitching performances of Wood, Villaneuva, Feldman (especially his last two starts) and Samardzija.