You are already answering the critical questions from experience.
What features appeal to what type of gamer in this title.
Being old fashioned I have always found that its the decisions on characters, when graphed that tell you what audience is being attracted to what features of a game.
If you give me the list of what people like, I can easily ask the Aion community to rate on what they traditionally have liked and you can see what audience exactly its appealing to. i.e. guided through, pve 80-pvp 20, pvp20-pve80, 50-50, sandbox.
One method is to list titles and ask them to give a 1-10 if played, and a weighting based on how long they played it, selecting popular titles from the genres you class as sandbox etc.
Asherons Call
World of Warcraft
Age of Conan
and what class do you normally tend to play ?
healer
tank
hybrid
archer
mage
etc
you can also factor in reputation in the general weighting applied to their contribution if you wish, but that would give spammers

too much power maybe. lol
But in your case I am willing to bet you already know most of the answers. And that intuitively thats what you write about.
TOG melee/hybrid classes who liked world of warcraft are attracted to Aion... for example, because of the gladiators all-round ease and Templars amazing durability as a classic tank....
Anyway you get the idea. It really puts it in the context of the reader imo. Using mmo's they did and didn't like and characters they did and didn't to answer what they might and might not like in the subject. Sorry for the ugly sentence and long posts