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IMHO:
1) Dungeon is not very suitable for rushing because at the beginning there are no strong spells and the army is not very durable (few Hydras). It is best to attack with the Dark Elves at the beginning of the second week... when the guild is already good and the troops are durable. But it is best to ask those who play Dungeon well.
2) I don't quite agree with you about Sylvan. If you build Druids at the end of the first week, you can start rushing as soon as you buy the growth: 20 Faeries, 20 Dancers, 14 Hunters, 8 Druids (divide by 2*4 or 4*2). But it is not worth delaying the game for the Wood Elves; Heaven and Necropolis benefit much more from this. Dungeon builds a strong army and upgrades the guild to level 5... Academics make good artifacts; perhaps only Inferno doesn't benefit from this. In terms of creature growth, Sylvan only wins against Dungeon... So, in the later stages, the ones who rule are definitely not Faeyda's kin.
P.S. The game tactics largely depend on the map and the player. For example, I don't really like quick battles and I don't see the point in finishing the game in the 2nd or 3rd week.