RA2 is my alltime favorite RTS so that was hard to beat with the new RA 3. 
But I gotta say  its a good game. Not as good as RA2 ofcourse but its good.
With the expansion you get a few overpowered units tho like the X1 tanks,  you can basically destroy the base of a brutal enemy with bout 5 of them or the giga fortress is also incredibly powerfull but once you set it to fly above land it becomes really vulnerable to anti-air planes but you can solve that with a few mecha tengos 

I also found the game confusing at first but when I played it a few times  got to learn all the hot keys and the good units. Just takes bit more time then RA 2 to get used to,  but overall not a bad game. Still better then all other modern RTS games I've played.