Ground Control is one of the strangely undiscovered gems of the strategy games genre.
Which is strange, considering, that this really is a strategy game, unlike most other games, which are more about tactics than actual strategy.
In Ground Control, you are given a number of squads (two at the beginning, more as you progress), which you can equip the best you can for the upcoming mission, and that is what you get to complete your objectives. No reinforcements, no base building, just the squads, your commanding APC (which is the only thing for a time what can heal your men) and the enemy who stands in your way.
The game is hard: you can't save, only between missions, your lost squads won't get replenished (but the soldiers in them will, even if only a single man survived the slaughter) and the enemy units and defense structures have exactly the same firepower you do. It is all about using the terrain to your advantage, listen to the briefing, scout, position, diversion tactics... you name it. And to support it, you get a quite easy-to-use interface and command system.
To support it, you get a storyline told in a somewhat StarCraft style (with talking heads before missions). The plot is not mind-boggling, but still quite strong, with conspiracies, betrayals, and a few twists here and there.
The graphics are very good, considering the age of this game. The view is zoomable to the point you can almost see a foot soldier in a first person view, the units are detailed, and so is the animation. The camera system is easy to use and quite flexible.
The not-so-good aspects of the game are usually centered around the difficulty and the lack of saving during missions. Later levels can be really hard with huge amounts of enemies and gigantic maps. It is not uncommon to spend two or three hours on one level if you're playing it slow and steady. So no, it's not a casual game, it is for hardcore RTS fans. Also, the second campaign in the basic game is not that coherent and fleshed out as the first one, that second seems a bit rushed. And some people may not like the fact that there are only two factions in the game, and most of the units are interchangeable. The expansion fixes it somewhat with a third faction with an almost completely different set of unit types, but to play that campaign, it is almost required to master the base game on harder difficulty first. The expansion really ups the ante, but at least gives you the two best units in the whole game, so it keeps that careful balance which really characterizes the whole game altogether.