I understand that these applications are of great use to Ashe, and my breakdown glossed over them, however I would like to clarify that I compared Ashe to Karma in a way that did not take proper application into account. I made the assumption that each champion would be played with the same skill level and thus their skills would be applied properly, without delving into the in-game mechanics.
I also stated that comparing vision to shields and the like is extremely difficult, thus each should be compared in their respective roles and not compared at all. As each are used in their own separate, overpowered ways.
Ashe's own personal poke may be powerful early on, however how do you compare such a thing to a pull, knock-up, or stun? All of them have the potential to catch someone out and have their ADC do all of the damage, which is their job in the first place - not the support's. Establishing lane dominance early is what many supports do; Ashe is simply one of them.
Free poke? Not really. The champions you will be facing usually have that range or more. Not counting their spells. You will be trading, not poking.
Ashe's Q will define her lane. It will be how you escape the ganks and it will be how you chase a won trade. You will always be using it, because otherwise you take away 1/4 of her supporting power.
Her ult costs as much as any other, meaning that big plays will still rely on her keeping track of her mana, like all supports. Simply ignoring this fact will set you behind, and possibly get your carry killed. Combined with your Q and W which you will be using constantly to keep your opponents slowed, Ashe is a difficult support to play.
I understand that unique scenrios can be conjured up, and the use of her skills and why they are useful is important, however the use of other champion's skills are also important. Things happen in-game. People outsmart one another and mess up. That is why I presented my points as if the counterpoints were just as valid. Ashe is a good support, but only in her style of supporting. She has a niche, and to say that her specific niche is the best is simply dismissive of all the other styles.