For 1 I'm not comparing EaW and Mech Commander I am comparing 3 aspects of EaW to 3 different games. EaW as a hole is Nothing like MechCommander, but the ground battles are. When you invade a planet it's just like MC. The maps aren't nearly as big and complex as MC, but the idea is the same you have only what you bring with you.
The space combat is almost the same as Star Trek Armada. Deference being STA is command & Conquer in space you build up you construction yards and bases. EaW doesn't really have that, but again even in space it has MC aspect you have what you bring with you.
The game EaW I would say is almost a clone of is Imperium Galactica II. I think IG2 is more complex then EaW maybe to the point where allot of people wouldn't like it. EaW doesn't have all the fine points IG2 has. The space and ground combat is better for the most part in EaW. I liked the sim city type aspect of IG2 that EaW doesn't have. If you like EaW type RTS I look up IG2 it’s old, but really was a good game.
It seems EaW is jack of all trades, but a master of none. I liked the Demo other then the bugs and think it will be fun. I’m sure there will be a huge mod community for it looks like there already is just for the DEMO.