I love Covert Action, but I'll be the first to admit it's because I learned how to avoid certain minigames for most playthroughs.
Covert Action is an old gem that covers the kind of randomized gameplay that is now hollowly echoed by the likes of Skyrim's "Radiant" quests as if it's some amazing new discovery. You have a goal and a set of skills that allows you to reach them; track down terrorists, collect clues for the more long term game of apprehending a set of elusive masterminds, and catch them all like a set of mad bombing Pokemon.
The difference from randomly generated games these days is that success or failure isn't a binary state. Sometimes you lose, but you still have more information on the people you're tracking. The next time that villain pops up, you're better prepared to apprehend them. Failure becomes a building experience, not a dead end.
If you're fine with state of the art graphics and gameplay from a time before people realized they could eat eggs, it's a rock solid way to spend your gaming time.
Sid Meier, the designer, was disappointed with the game. He felt it had too many minigames, and that none of them were very fun. This is kind of valid; I definitely hate the driving sequences, but equally love the stealth action segments, wire tapping, and cryptography. If you start on easy to train yourself and slowly amp up the difficulty, the challenge is masterful and gives you the tools you need to stick to your own strengths, to avoid the parts you like less.
The game feels smart, too. You can hang back and collect intel over the wire, or go in and steal files, follow cars. The world feels comprehensive and wide open, in an 80s DOS kind of way. There's a lot to do and figure out.
Covert Action lacks the scope of Sid Meier's timeless Civilization series, but is also playable in micro-doses. It's another game I can come back to, time and again, for a few sessions when I don't feel like blowing three weeks on an epic.