The game design is nowhere near as good as 1 or 2, messier, clunkier. And it's way way too easy -- big part of draw of 1 and 2 was that I had to think to win (on appropriate difficulty level). 3 on highest difficulty level? Doesn't feel challenging at all. Not a good strategy game imho.
I remember playing it as a kid, and it was hard, both part 1 and 2. Played it recently, and it was still decently challenging on highest difficulty level. More so 1 than 2, but luckily part 2 can be played with a -10 picks race, making it a good challenge. Graphics are appropriate for its age, but it is about strategy and atmosphere more so than graphics.