I'm not defending his attitude, and it goes without saying that the comparison to McHugh is not a flattering one for our Ken. My assertion is just that he's been very consistent this year: consistently excellent in traditional save situations and consistently bad in non-save situations, yet he's been again and again used in the latter.
I would imagine that a forward-thinking team like the Astros is interested in getting away from the Larussa-mold and utilizing their best reliever at what they deem to be the most crucial spot in a game, regardless of whether or not that would result in a "save." As I've experienced it, the problems with Giles this year started when they tried to do just that, but for whatever reason (mental toughness, immaturity, vanity, crap luck, you name it) he exemplifies the closer-in-the-non-save-situation struggle bus.
Add to this his particular history with the team (brought over at great expense to be the sort of savior that would've suppressed the 2015 Royals; stubbornly undominant; the trials of last year's postseason [although, as someone here pointed out then, we beat Kimbrel, Chapman and Jansen during the same stretch]) and it seems like the deck's been stacked against him a bit.
All told (postseason included) he's blown 10 saves in 73 chances since coming to the Astros (86% conversion). For comparison's sake, during the same stretch Aroldis Chapman has blown 14 saves in 139 chances (90%), and Kimbrel 8 in 101 (92%). He's a Lincoln we paid Audi dollar for.
Anyway, it'll be interesting to see how they decide to handle the situation going forward.