I love this game. I have loved it ever since it came out in 2002. Yes it's an older game. Yes it has bugs. But these can be worked around with a simple amount of research (like the sound error that some people get). And no it does not have widescreen support. You'll have to enjoy the game with either the black borders or a stretched image, depending on your computer's settings. Is it inconvenient? Yes. Is it game breaking? not in the slightest.
For a 2002 game, the game play is great, and the graphics are great (for a game of its era) and the explosions are great even for modern day games.
It's easy to get frustrated when you fail a mission, many people haven't quite gotten an understanding for the game yet and blame their mission failure on bugs. I've beaten the GOG version several times and I will surely play through the steam version just as many times. The replayability of this game is endless to me.
This is not a short game to play through, many missions will take hours to complete. You start out in the Earth-Mars war, you even get to choose who's side you want to fight for. These missions are introductory missions, teaching you how to play the game, planetary management, and research, and the levels get progressively harder as you go. In some missions, money management is absolutely CRUCIAL.
Battles can be quite intense at times and definitely fun to watch.
If you enjoy Space RTS games, this is definitely the best. Yes it's old, but its fun, very fun and a must have. Just make sure if you get errors, you look for the fix before rageposting about how "bad" of a game it is.
Oh and, in the first missions, make sure to press the F1 key (it will inform you of this) as all the information for controls you need will be listed there