They are currently in a 3 way tie for 25th in total HRs as a team. Specifying "top of our order" moves the goal posts of the discussion. Certainly the top is going to bring more power than the bottom of the order. That's true with practically every team. For sake of the distinction though, boil it down to Yelich, Chourio, Contreras, Bauers, Turang and Vaughn. On paper that looks like a tremendous amount of pop (especially if we add in Mitchell AND he was living up to his power hype - which he's not).
Bauers is MIL's top HR hitter currently. He is ranked 38th in MLB at 14. That doesn't scream they "can slug with anyone" to me. To be fair, Yelich, Vaughn, and Chourio missed most of the first month or so. But again, to be fair, that hasn't really mattered. Yelich has become the ghost of power hitter past and Vaughn has traded power for average. Chourio is putting up respectable numbers. Turang started hot, then dropped like a rock, still likely to hit the 20 or more mark. Contreras like to end up with his usual numbers around 18.
Obviously, overall slugging is more than HRs. But as a quick way to measure I go by HRs because the slugging follows suit more often than not. I just don't see the "we're fine, they can slug with anyone" that you feel. At the end of the day, they're more likely to come up short in Oct again because they don't have enough big pop in the lineup than they are to ride their top pitching and sub adequate power. Just my opinion.