Trumbo sucks, but Z gonna Z, I guess.
I don't hate Nuno though, they just started Montgomery, rotation depth is a huge organizational need. I approve of that part of the deal. He'll be a better Mariner than Trumbo will.
Moving Castillo is weird, but I'm not going to bitch about losing the backup catcher. Leone only hurts since you've moved like five relievers in the past three months. He's not especially valuable. Rennheimer is Chris Taylor light, which is to say he sucks. Guerrero is the big name prospect here, and I'm sure he'll blow up now that he's been dealt, but he's always been highly overrated just because of his bloodlines. I like him but don't love him.
Overall we upgraded our starting pitching depth while downgrading our catching depth. And we acquired another Jack Z specialty immobile 1B who will be playing OF because Mariners in exchange for some bullpen and MI depth and a good but not great OF prospect.
Not a terrible deal, but one that says nothing but "we're desperate!"
Nuno could become a solid #4 or #5 starter. I like that part of the trade. Trumbo is meh. Cruz is the first RH power hitter to do well playing at Safeco. Trumbo doesn't offer much at the plate other than power and he's a bad outfielder.
I don't think we gave up anything of tremendous value, but this article outlines why Trumbo doesn't really help.
http://espn.go.com/blog/sweetspot/post/_/id/58920/mark-trumbo-doesnt-fix-mariners-problem