Tiger, Nice to see you get jumpy and defensive but I didn't say your Hawke didn't have combat Prowess.
What I said is Combat Prowess is no measure of leadership. Yes. You killed a High Dragon and not everybody can do that. Doesn't mean you know how to run an organization and it's not even a unique feat. The Warden can potentially kill a few of them. The warden also manages to broker an almost impossible peace between Zathrian and witherfang as well. Manages to influence the whole of the landsmeet to change the tide of civil unrest, Survive and influence Dwarven politics, and Potentially win over the hearts of the people of Amaranthine after taking it over from it once being an enemy stronghold.
And what the little loading screen blurbs say are conjecture and flavor. They aren't necessarily reality. The Truth of the Matter is that Politically and diplomatically Hawke is kind of a figure head.
Yes it does irk me that somebody supposedly so powerful manages to, in the context of their story (railroaded or not is irrelevant), either do nothing or actually make matters worse (particularly in spite of a few of the choices we can actually make in the game play portions to try and actually make things better). The fact that the narrative parts are still part of Hawke's story and the way Hawke managed to do things whether we like them or not are in fact indicators when it comes to things like the ability of that person to lead. The Fact that the city actually gets worse in the time between the key events we actually get to play and influence shows that Hawke is a poor leader. Specially with the conjecture about how much influence that Hawke has over the city. If we take the conjecture as further evidence it actually means that Hawke whether meaning to or not actually made the problem worse trying to lead the city even though Hawke acting as a lone agent with a small group actually manages to solve some of these problems in the end and potentially even improve the city. There is also the fact that we are never told the actual circumstances in which Hawke leaves the city and potentially the position of Viscount after act III. If Hawke were such an effective leader then it would have been a difficult if not impossible feat to walk away from such a position with being such a key piece of influencing and holding the city together.
Hawke literally is supported by others that do almost all of that for them. Hawke doesn't do the moving and the shaking really. Varric is connected from very early on in the game to pretty much anybody of importance in some way. And then Aveline and in some ways Isabella support this by being rather big figures in their own realms of influence. There are even some nice conversations between Aveline and Varric about his stories being spread around and what they are doing to cause strife for her or build up reputations, including Hawkes. And there is one with Hawke directly where Varric admits to blowing things a bit out of proportion in the stories to make Hawke who they are. It is also these people that get Hawke involved in a large part of various events in Kirkwall.
And Look Varric is now working for the Inquisitor. Guess that takes the connections and diplomacy card out of Hawke's hat for Leadership.