1.Successfully navigating dwarven politics is a major factor, you have to be very good at the great game to choose a strong candidate in orzammar.
You don't have to be at all qualified, really. You just pick one or the other without really knowing much about them if you aren't a dwarf and don't listen really closely and read between the lines. To even get an audience you basically have to run down to a tavern to show Helmi some papers and then run down to the Aeducan Thaig to show Dace the same ones or win a Proving and possibly steal back some letters and tell someone that Dulin doesn't think Harrowmont's giving in. That's really not very political and any skilled thug could manage. Then you have to wipe out the carta. The DC already did that once back when they were just a skilled thug. Oghren and Bhelen/Harrowmont's men have found Branka so you have to kill your way to her, kill some golems, then kill either Caridin or Branka herself and due to the reverence dwarves give Paragons you've crowned a King (but you might need to kill Bhelen and half the Assembly first). That's hardly any great political manuevering on your part. Yes you could take the time to try to truly understand the situation (but remember you know nothing about dwarven politics w/out metagaming except that it's brutal) but that's hardly a requirement to get the job done.
Being a General of large armies does have some political traits to it as well, the warden takes all of the factions in ferelden and organises them into a fighting force.
But you're not appointed general until AFTER the Landsmeet and by whoever is already slated to get the throne. Duncan thinks to get the treaties and you just show up and demand that people follow them which, after you kill enough inconvenient people for them, they do. An understanding of politics is not required for this as anyone from a human-hating 'let's just get this over with' Dalish to a 'I'm just going to kill things and hope that works' Casteless can do the same.
Lets not forget that being raised as a child of Bryce Cousland makes you a Born politician assuming your character payed attention to events in highever.
Anora has been slate to become the Queen since Cailan was born so she was raised for the express purpose of ruling so her education is better in this regard.
4.I can't fault anora as manipulative or cold those are vital to politics, but i don't think she has what it takes to handle fereldens rougher politics and she mismanages several affairs if you select her as sole ruler: the Orlesian embassy debacle and the alienage politics being major ones
Orlesian embassy debacle? You mean the statue of Loghain? I don't remember that causing problems. Does it say that it did? And the alienage situation was handled just fine. Anora used them as scapegoats when she was having problems with food. It's not a nice thing to do and she's not personable but it was effective in getting people focused off of whatever she didn't want them dealing with. Additionally, since Anora's rule is shown by the long-term effects and Alistair's is just shown as 'people love him, he either takes his job seriously or keeps leaving court, and he appoints an elf to his cabinet' that's far more short-term and who is to say he doesn't also encounter food shortages? Anora isn't very personable, it's true, which is why she's more effective with a more personable husband like Alistair or a HNM. It's hardly a fatal flaw, though.
5. I managed to convince the majority of nobility in the nation Including every major arling and bannorn and the grand cleric of the chantry to side against the queen of ferelden and her war hero father, how much more brilliant can you get!(gotta love persuasion)
They are only siding against Anora if she comes out in support of her father. She automtically carries three votes with her, you know, which is a good deal of the votes in-game. And even that isn't so much brilliant political strategy on your part so much as 'hey I killed a bunch of people at Howe's estate and you would not believe what we found there.'
You seem to forget that going to Howe's estate and killing Howe to weaken Loghain's influence was Anora's idea when she pretends she was in need of rescuing. Finding Oswyn and Alfstanna's brother - as well as Riordan - would not have happened if you hadn't followed her plan. Without Anora you wouldn't have known to go to the Alienage, either. So really it's not YOU managed to turn everyone against Loghain, it's Anora uses you to do it. Sure she can betray you and side with Loghain after all but that's only if you admit you don't support her, never talk to her although she asks you to so she can assum you won't support her, or if you sound too bloodthirsty about her father and he's always her biggest weak point. The politics here is all Anora pointing you Howe's way and Howe is arrogant enough to keep his crimes on full display. If anything, that makes me more impressed by Anora then by the Warden for following the trail of bread crumbs.