Easy to play. Quick to teach. Games are quick. Highly portable. Strategic with some luck. Complete 2-player game in base set (add Colony Wars to get 4-player while also getting new cards, as that is a standalone game). Fantastic deck builder at a super low cost ($10, but even $15 is a great deal). Addons are not necessary at all, but do add flavor. Theme is pasted on, which in my case is a good thing (my wife doesn't care for sci-fi much, but loves this game). We like Star Realms over Hero Realms, but both are great. There's no reason not to own this unless you hate deck builders.