I used to play it religiously when it first came out, and then Kingdoms after. I revisited it last year when I was in halls and me and my friends had regular langames with it, and also with the World Domination total conversion which was great fun.
Haven't played it in ages though. One of my uni pals has my TA cds and TACC. Gotta get it back from him sometime soon.
And yes. BY FAR the best RTS game of all time.