Here's some preliminary analysis: last year we were 4th in the league in runs scored (the ultimate offensive stat, really) and this year we are 14th. Why? A couple of things immediately jump out. First, last year, although we led the league in strikeouts and were ninth in batting average, we covered that by being first in homers and second in walks. Thus, our OPS was third. This year, we are only 7th in homers and have dropped to 12th in walks. Our batting average has dropped somewhat, relative to the league (from 9th to 14th), and our strikeouts are somewhat improved (we are "only" third in the league this season). HOWEVER, due to the significant drops in homers and (especially) walks, our OPS has dropped from 3rd to 14th.
Comments: I am relatively unconcerned about strikeouts. They pretty much don't matter in the long haul. Likewise, I don't dwell over the semi-mythological concepts of "manufacturing runs", and "productive outs". What DOES matter is our ability to get on base and to hit with power, and those two things have fallen off the cliff, relatively speaking. I don't necessarily thing the design is flawed, but if you design an offense around walks and homers, you'd better be able to walk and hit homers, which we aren't doing right now.
Now, why aren't those things happening? Everyone's guess is as good as mine. But Walker and Fletcher were here last year when we scored plenty of runs. If "design" is the issue, neither of them is responsible with that. Will we "normalize" over the rest of the season and increase our walk rates and power numbers? Who knows?
I haven't gone behind the numbers to look at things such as line drive rates, BABIP, Homers/fly ball, etc. but I invite someone to do so.