Sorry to bring this post from the dead but!
I'm kind of trying to wrap my head around how people can excuse the Gray Wardens for what they did in Adamant so easily.
Yes, I felt horrible seeing Alistair's face frown when I exiled them but a) they are susceptible to Corypheus' mind-control-**** - this caused them to sacrifice the Divine,
they scarified their brothers and sisters out of obsession to the blight out of their own volition (under the pressure from the calling), c) demons. Just.. Demons. It's obvious this is a bad idea!!
I feel that because of the fact the Gray Wardens starred it the first game that people love them, this game also made people hate elves and mages I think
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There's a difference between excusing them and giving them a chance to redeem themselves. The Grey Wardens are a faction, as such, just because part of that faction displayed an enormous lack of foresight and judgement, it doesn't mean all of them were to blame. Leaders also have to take responsibility for the actions of their subordinates, even when dealing with such extreme and unprecedented situations. Also, a lot of Wardens can be persuaded to see reason when it matters most during Here lies the Abyss.
I don't believe our decisions pertaining to their fate is a question of white or black, like most situations, it's in the grey (yep, bad pun intended). Also, from a roleplaying perspective, I don't believe that Corypheus potentially manipulating them is as strong an argument as it was before Here Lies the Abyss.
Remember we disabled the nightmare demon that was used by Corypheus like a broadcasting station to amplify the range and effects of his "calling". It's also a fact that the Grey Wardens are now made aware that this "calling" is false. They weren't "controlled" by Corypheus but rather acted out of desperation and fear based on a lie. Quite literally a "living nightmare". This new awareness therefore strengthens their resolve while bringing much needed perspective to their future actions.
This leads to the choice being one of personal opinion and your personality type rather than right or wrong and pure strategic thinking.
The way I work is based on who we "choose" to sacrifice to the nightmare demon.
If I let Hawke sacrifice himself, Then I exile the Wardens. They have a very capable leader (Loghain) who can lead them back to Weisshaupt without potentially endangering the inquisition (Loghain also saw through the calling and resisted being manipulated or resorting to desperate measures because of it) in order to get much needed answers.
If Loghain sacrifices himself (hardest choice I had to make the first time I played through this mission) then I absorb the Grey Wardens into the Inquisition. Given Loghain's sacrifice, I tell them he is the ideal they have to strive towards. I forgive their actions but never do I forget. Given the context, I give them a chance at redemption, because as misguided as their actions were, they were driven by a desire to protect. My Inquisitor listens to his conscience, but he also is a pragmatic man. I'd be fully aware of the Grey Warden's liabilities as well as their value as assets. This is where the Corypheus "control" doesn't bother me. It's even stated in-game that the potential for manipulation is considered. I still find it a bit weird to actually see them walking around Skyhold (though I do enjoy seeing them), but I attribute that to aesthetics more than anything.
Anyways, if you choose to keep them, I'd assume you'd deploy them strategically and always treat the situation with care while taking calculated risks. Deploy them where they can help best yet not fall prey to Corypheus. Use your spy network to track their progress as well as the enemies'. Again, as stated above, circumstances regarding them have changed. You adapt and use the situation to your advantage. Besides, having Wardens within the Inquisition after Corypheus' defeat makes for a very powerful statement as well as great forward defense in the case of an emergency regarding darkspawn, blight or otherwise.
That's how I see it 