I played this so much as a kid, its Age of Empires 2 ... so its a good RTS, but it also has a good, fairly well polished Star Wars skin, I found the campaigns interesting and enjoyed the storylines. I liked the diversity of races ie, gungans don't get machines and can build underwater. Being AOE2 the campaign editor, random games etc all work well. This is simply a really "good old game" at (in my opinion) a very cheap price. The second I saw this was on GOG I picked it up, I lost my old discs and had been seriously considering getting a new set on ebay. Oh and the expansion..... its included here anyway its that's pretty solid as well, Episode 2 focused of course though.
