Anyone that says anything other than, "the 2015 Atlanta Braves offense was putrid", is wrong. Period. There was zero silver lining or positive takeaways from the 2015 offense. The point of an offense is to score runs, not to hit more singles or K fewer times...or for fans to "have more confidence they can score runs".
All we can do is look for improvements in 2016. A full year from Olivera, a healthy year from Freeman, a bounce back in the power department for Markakis, a full year of a Castro/Peterson platoon at 2B, any improvement in LF, and repeat performances as a whole from the other positions should bump the offense up to at least a respectable level (meaning not bottom 5 of the NL).
An offense that scores 650+ runs should be good enough to make a push for .500 next year when coupled with the expected improvements in the pitching staff.