While the score and sound are just as good as the day of its release, graphics hardware has moved on and this leads to lower fidelity textures as well as problems controlling the targeting reticle even with mouse sensitivity at the very lowest setting. I never played it on its initial release, but I could forgive the somewhat bullet-spongey enemies which infinitely spawn if controls were responsive. There's a decent level of differentiation in enemy types and AI, better than some modern games. The ability to easily give context-sensitive orders to your team is balanced NEEDING to; they don't have great AI on their own, and it would probably be manageable were it not for the control issues. The plot is straightforward and characters are appropriate to a focused war game, nothing deep but it's a tactical action game.
Difficulty is customizable, you can turn off PVP to disable griefing, and flying and exploring is better than any comparable game I've seen. However, sometimes the game won't connect to "discovery" so you can't see other players' bases.