From the Brewers perspective, this trade makes a surprising amount of sense. With John Axford firmly entrenched in the closer role in Milwaukee, its likely that K-Rod slides in as a set-up man and doesnt reach the 55 games closed that would vest his option. And even if Rodriguezs option does vest for some ridiculous, illogical reason, this is still not a horrible trade for the Brewers.
If the option vest, the Brewers would then pay Rodriguez $17.5 million for essentially 1.5 years of service (prorates to $11.5 million / year), and his help in the bullpen this season could help push the Brewers into a playoff spot. The Brewers are currently tied with the Cardinals for the AL Central lead (and the Pirates are only one game behind them), and Baseball Prospectus gives them a 45% chance of reaching the playoffs. Their bullpen has been mediocre this season, posting a 3.92 ERA (20th in baseball) and 3.68 FIP (10th in baseball), and they could use some high-leverage help outside of Axford. Teams that are close to the reaching the playoffs should be willing to overpay if it will helps improve their team for the late-season run
and its still very, very likely that Rodriguezs option wont vest.
So even though the Mets arent getting much in terms of minor-league talent and the Brewers are taking a calculated risk, I view this trade as a Win-Win. The Mets free up some much-needed payroll space for next season, allowing them to reallocate those funds to more cost-effective routes (like a Jose Reyes extension?), and the Brewers add some talent that should help them make a push for the playoffs. You cant ask for much more than that.