I don't know how much you can really interpret from this season, but they may have had the best pitching they've had in years.
Starting pitching: Burnes and Woodruff have been outstanding (Woodruff has had lousy run support so his record doesn't reflect how good he's been). Anderson and Lindblom have been adequate. Houser's been awful. 4 decent starting pitchers.
Relief Pitching: Hader had two bad outings. Otherwise, he's been Hader. The rest of the bullpen has been very good. Devin Williams has been as good as anyone in the league. Even their worst bullpen guy (Claudio) has been decent.
The problem this year has obviously been the offense. Only maybe Ryan Braun and Gyorko have given them at least what they expected. Almost every free agent position player they signed has been awful. Their three veteran signees (Narvaez, Smoak, and Brock Holt) are currently 41 for 244 (.168) with 7 HRs and 25 RBIs. They were supposed to replace Grandal, Moustakas, and Thames. The front office just completely whiffed on those decisions this offseason.
Yelich and Hiura have been strikeout machines. Arcia, Garcia, Sogard, and Urias have been what's expected on offense (fairly anemic).
The one thing that they couldn't control was Lorenzo Cain opting out. If he plays, they are probably safely in the playoffs right now, even with all the other offensive problems.