The designers should rename the marks, seals, quintessences, etc to:
People are going to call them that. This FAQ calls them that. Don't kid yourself, quintessences?
I would specifically mention the (primary) (secondary) descriptors. So people know that secondary means 1/3rd power since it is not a good rune for its color.
Also mention T3 is better than T2 and T1.
Its weird that Primary (1) is better than secondary (2) in one case and Tier 2 is better than Tier 1 in the other case. Either low numbers should be best or high numbers should be best in both cases.
Anyways great work on this game. DotA done right.