Second, visuals make the gameplay happen. Your narrow definition of what visuals means is your problem. For example Plants vs Zombies is a brilliant game, and it wouldn't be so without a specific kind of visuals, the same can be said for Defense Grid: The Awakening(also high level of animation).
Good point hortz! Plants VS Zombies is a perfect example of a great game with mediocre graphics! Pointing our defense grid: the awakening as an example of a terrible game that has amazing graphics and yet sold far more poorly continues to support your position!
Third, your Tribes 2/Crysis comparison is a total failure since it's based on a subjective opinion(completely faulty and unwarranted I might add) and an argument from popularity fallacy(which is btw heavy on the Crysis side).
By the way, if the "popularity fallacy" is inadequate to measure a games quality (of course, why measure a games quality by how well it sells? Sales mean NOTHING!) how exactly does one measure a games quality if not subjectively? Shall we use the Hortz-ometer? I do believe I have PWNED you, my logically faulty friend 
The theme of the game is the main criteria as to deciding whether visuals is successful or not within that theme, at this point in games development there is no basis for not having a high level quality of visuals in a game like Elemental, because the field in which it wishes to operate has already high standards, and anything less would make the game look regressive, outdated and unenjoyable because our perception has already gone through accustomization process to those standards.
The field in which TBS games operates has "high level visuals"? Really? Are you basing this solely off of kings bounty? The visuals look up to par when compared to civ4 or say empire total war (Civ4 btw continues to sell well years after its release. The far more "shiny" looking empires having long ago been abandoned due to its shoddy gameplay). And I like the generalized statement that everyone has become accustomed to cerain standards! Your argueing against a huge group of people who obviusly have not my friend.
Someone from SD should seriusly close this topic. It's now just become a troll feeding ground.