Did they make the right adds? Naylor has been great, but Suarez is hitting .105 and striking out every other at-bat. He looks like his old self again from what I have seen.
The Mariners issues coming into the deadline, in my view, were defense and relief pitching. They were already bottom 5 in defense before adding Suarez, giving them the worst left side of the infield we have seen in quite some time. Naylor is average defensively so I don't see a big change there.
Their bullpen is also bottom 5 and exactly replacement level of you exclude Munoz, but all they added was a depth lefty. Perhaps they get away with that for a series, but one bad start and their AAAA guys are going to get exposed.
Orgfiller also correctly pointed out that the rotation can be a bit overrated at times. I understand that this doesn't tell the whole story, but they aren't even top 10 in starter WAR, let alone some unbeatable juggernaut.
I see a fringe playoff team with a lot of flaws being carried by an incredible season from Raleigh.