I'm not a big RTS fan, but I actually really enjoyed this one. It has some interesting twists with customizable units (for 3/4 factions at least) and different resource needs for different factions which adds an extra angle to the strategy. The four campaigns link together nicely, although the final mission of the last campaign was way too easy and the ending was a bit of a let down.
Graphics are pretty good, sound falls out of sync in the cut scenes (possibly because it was translated?) and some of the unit voices are a little annoying.