While it's a valuable game for historical purposes and innovative for its time, out of the 3 Warcraft RTS games, this ones has aged the least gracefully.
Only being able to control 4 units feels incredibly limiting.
Orcs and Humans being the same in everything but names, models and sounds basically makes every game a mirror match, which eventually gets pretty boring. Pathfinding also felt pretty bad.
On the positive side, the mission briefings are cool. And the graphics have their charm.