RoN never had good combat imo, bit cartoonish imo, but it was I admit very very addicting, the thing tho that was terrible about it were all the limits and caps, even at fast game speed I always hit all my caps, commercial caps, military ones, city caps, should be at least 4 times as high the caps ( the max cap I mean once u get all library techs done).
Ontopic:
Empire earth original is great still imo, alternatively you could try the C&C series.
Have played AOE2 for like 4 years (including clan and matches etc) and the original aoe even longer, but not as often as aoe 2 though, still one of the best games ever imo.
My old clanmates that were hooked on the aoe series moved on to age of mythology and the warcraft 3 games but I personally didn't like the warcraft games that much as it was leaning towards being an rpg and I don't like em. Liked AoM for a long time but when the expansion came out (and I bought it) I somehow lost interest very soon after.