I've considered the recruit Loghain route, but always defer to Alistair's rant. Looking at the various origins, however, it seems that most Wardens would have gripes against Loghain that go beyond Ostagar.
How can you justify letting Loghain live if you're a city elf and have seen how Loghain tried to sell your alienage into slavery? Despite lacking a direct connection to the city elves, I would expect a Dalish elf to hold a grudge against Loghain over this as well.
If you're a human noble who had his/her family massacred by Howe, you likely view Loghain as a silent accomplice to the crime.
The only origins that I think would even consider recruiting Loghain would be the dwarf origins and the Circle Mage origins since both would not have been directly impacted by Loghain's dirty intrigues. But even here, in order to get Loghain, you're forced to throw Alistair under the bus. Not an easy thing to do since it feels like the betrayal of a friend....
I'd personally scratch the Mage Origin, since Loghain's "dirty intrigue" with Uldred was what led to the Broken Circle questline.
(Having promised to free the Circle in return for supporting him, Uldred and his followers tried to convince Irving and the rest of the Circle to support Loghain, and they almost considered it until Wynne revealed Loghain's treachery at Ostagar. When the rest of the Circle withdrew faster than a hand on a hot stove, Uldred became desperate since he saw his one chance at freedom slip away, and this desperation is part of what caused him to summon that Pride demon, fuse with it, and destroy the Circle. Unless your mage completely loathes the Circle and/or everyone in it, you'd probably not be happy with the carnage Loghain caused with his "dirty intrigues.")
So, yeah. City elves and Dalish elves probably wouldn't be happy due to the elven slavery thing, Human Noble probably wouldn't be happy due to the "allied with Howe" thing, Mages probably wouldn't be happy due to the Uldred thing... I guess that does kind of leave Dwarf Origins.
Although, in my case many of my personal Dwarf Commoners loved the Grey Wardens and Duncan specifically for giving them another chance at life (since life in Dust Town sucked so much, and being a Grey Warden gave them a sense of purpose, honor, and belonging they never had before), so my Dwarf Commoners personally hated Loghain just as much as Alistair for killing Duncan.
So... yeah. Dwarf Noble?