I remember years ago watching my father playing this game, and then playing it a little as he watched. Naturally, I got hooked. I've played this game time and time again, probably five or six times through to a tech victory, several times to other types of victory, and many times to a loss. It never got boring. The only problem with Alpha Centauri is if you start on it, you'll find yourself playing it when you should be waking up in the morning.
Fallout is one of those games where you have to be on your toes. It will kill you, and you should remember t save often. That's why it took me so long to truly appreciate it. Save often, and you will win. It's just a matter of knowing what to do and when to do it, and when to pop a anti-radiation pill.
Antaeus Rising is one of the greatest action/RTS hybrids. It plays kinda like Ground Control (that's what I thought once I got in game, at least). However, it also has a nice amount of good ol' shooting action, and it has strategy and resource management in a pain-free system.
This game has a little bit of everything. It has a mixture of light-action gameplay and a fair deal of mech-shooting strategy/customization. My only gripe would be the torso-twist aiming (MechWarrior 4 fan) causing me minor disorientation, but it's not a problem after a short few minutes getting oriented.