Addictive is not always good.
Civilization II is probably the most addictive PC game of all time. The gameplay is perfect -- complex and brilliantly designed so that there are always several things you're looking forward to that are coming up in just another turn if you just keep playing 30 seconds longer. Hours later...
The interface is easy, and between the in-game civilopedia and the poster (tragically missing in Civ III), every unit, improvement, and technology is thoroughly explained. Also this game is extremely friendly to being tweaked by the player.
Civilization II is probably the most addictive PC game of all time. You'll keep playing long after you've stopped enjoying it on any level beyond cheap compulsiveness, wasting hours that could have been spent lying in the sun or playing a greater variety of games.
The graphics are unexceptional and I hate the music (but you can turn it off).
The Bottom Line
Super-addictive civilization-building strategy game.