My brother was a big fan of Star Fleet Battles. I enjoyed it when we played, but it was more his thing than mine. Later in life he got into Warhammer and other miniature games, and I tended to stay with the classic historical wargames.
I liked Axis & Allies. I was very surprised one time when I was using a strategy reliant on those Industrial Factory pieces, and it turned out that the RULES had been CHANGED by the game publisher without any sort of indication.