and that's where i disagree,since to me and apparently others players as well, lose Alistair for Loghain was well worth it.
I'll bite, but here's my full case.
In the past year or so, Loghain has effectively been digging a ditch both for himself and for Ferelden. From his point of view, he was trying to save nation, but objectively he was dooming it. That's the ironic tragedy of Loghain's character as presented in the games. He truly believes that he's doing what's best for Ferelden, but he's completely wrong. Worst, he bought into his own legend and he can't even see how he's becoming just like the very Orlesians that he'd thrown out decades ago.
1) Ostagar
I won't fault him for withdrawing from Ostagar since it was a lost cause. From a military and strategic perspective, withdrawing preserved strength for later which would have otherwise been wasted.
However, I'd remind folks that Cailan was indeed following Loghain's plan. Loghain is the one who came up with the Anvil and Hammer Strategy that the Beacon was central to. So the idea that Loghain abandoned the king isn't without merit since Loghain didn't so much as send a messenger informing the King of his withdrawal so that Cailan could at least try to escape himself. Instead, Cailan died waiting on Loghain to perform his end of his plan and many others died with their king. From a moral and ethical standpoint, this is dubious on Loghain's part and puts his trustworthiness into considerable doubt.
However, I won't hold this as a negative against him.
2) The Civil War
Loghain isn't completely at fault, but he deserves the lion's share. Loghain has been running his nation for nearly 30 years and should know the temperament of his own people. He should know that attempting to just seize total authority without a proper vote on the matter would anger the Bannorn. He should know that his timing was terrible. He should know that having Anora call a Landsmeet to determine who will rule would be the better option.
Instead, he kicks a hornet's nest and is surprised when the hornets sting him.
It should be noted that Loghain apparently struck the first blow in the war. He responded to the Bannorn's reluctance with force and threats including executing Bann Grainne when she destroyed her land's harvest rather than allow Loghain's army to feed off it. His heavy handed tactics effectively turned his own people against him and ensured that the Bannorn would burn before willingly bowing to him. This is Loghain's single greatest mistake and its the catalyst for other problems and woes.
If Loghain isn't responsible for starting the war, he's definitely responsible for escalating it.
So this situation displays a considerable fault in judgement and diplomacy.
3) The Warden Bounty
He may hate Orlais with good reason, but framing the Wardens for Cailan's death and actively trying to murder them was a mistake.
Blocking further Warden aid also meant that Ferelden was going to be left to the wolves. Wardens have historically been proven to be the only order capable of defeating the Blight and Loghain has turned them away when he needed them most. So even if Loghain had won the Civil War (which was an effective stalemate by the Landsmeet anyway), he would never have beaten the Blight.
He allowed his own paranoia to doom his beloved Ferelden.
This displays tendencies of treachery, deception and personal paranoia. So the ditch goes deeper for Loghain here.
4) Howe
Loghain's worst misstep by far.
This stands whether or not you believe that Loghain had anything to do with the Cousland massacre like I do. (for the record, Gaider doesn't explicitly say that Loghain wasn't involved. Merely that Howe did things independently and Loghain tolerated them. Which actions these happen to be are still ambiguous.)
Howe is an unpopular noble who has committed treason, mass murder, slander, torture, and later embezzlement.
If Loghain's ship sinking, it got a lot heavier when Howe was allowed aboard. Loghain lost any moral high ground that he might have had by picking this worst of the worst scoundrel as his bedmate. Then he appoints him as Teryn of Highever and of Denerem? Worst yet, Howe revels in tyranny and brutality over his lands in Amaranthine, Highever and Denerem and his antics as the "Butcher of Denerem" become known as far as the Free Marches.
This is also the same man who'd go on to kidnap the Queen herself, Loghain's very own daughter and use her as a hostage. This sounds like a guy who was itching to off Loghain somewhere down the line. It's even implied that Howe was influencing Loghain further down the dark side and making Loghain lose more and more of his moral standards.
Part of being a good leader means picking the right allies and it's never smart to give power to someone that you can't trust. Howe is the literal definition of a poisonous ally whose going to get you killed.
The man is voiced by Tim Curry for crying out loud!
5) Selling the Alienage into Slavery to Tevinter
Speaks for itself. What Loghain did here was illegal, unethical, immoral, and he did it after straining the country's finances to try and save some economic face. Can't say much else.
6) Eamon
I can't say anything about this topic that hasn't already been said. But I should note that Loghain not only interfered with Chantry business by capturing, imprisoning and torturing a templar; but he also used a known blood mage and Circle runaway that the templar was pursuing for his plot to incapacitate Eamon BEFORE Ostagar.
So that's multiple strikes in one.
Conclusion
Loghain's proven himself to be more of a liability in the past year than a benefit. Any genius or ability that he may have is overshadowed by failure and misstep after failure and misstep since Ostagar. As Grey Wardens try to recruit the most capable and proven candidates to be Wardens, why should Loghain be considered?
In light of his epic failure, why should he considered more valuable than templar-trained Alistair? Or Zevran? Or Sten? Heck, I'd even pick Ser Cathrien considering that she's as tough as a High Dragon.