That's because some of the guys from AoE came over and joined Big Huge Games and helped MAKE RoN. Not to mention it has a COMPLETELY new strategy: commerce. You can't get a gajillion of each resource, you have to research how much intake you can get per resource in that particular field. In this case, if you had a ****load of food coming in, more then you could handle, then you dont get that extra. If your commerce cap is at +100 resources, and you are picking in +120, you loose that +20 because you cant take it all at once. It's just wasted. That way we dont have major-resource hogs in the game because you just cant OCCUPY everything you see. Not to mention, getting units mixed and matched together adds blend. Take for instance one game that has big-bad units, where you can make an ENTIRE army out of only them:
IE:
1) Dragoons
2) Hydralisks
3) Battlecruisers
4) Mutalisks
You can build an army of 10 teams worth, and you basically won. Unless, of course, you have the SAME amount of units on the other side. But this game adds depth, as well as anti-rushing with the atrition damage you suffer when entering other territories under peace, as well as under war. Not to mention that running into a fight is stupid, and tactically taking a city or the high ground always works out in your favor. And, as someone above mentioned, you get bonus attack and defend points for flanking your opponents when they are engaged.
All in All, this game rocks, and I personally love it's new style.