i forgot to mention that in the new TA that is coming out, there are more additional features like map and scenario editors, and other extra goodies.
ALso, would you consider chess is not a good game if you can only play against one player. But what if i tell you that the computer is as strong as a human if you were to play against the computer only, or even stronger, does it make chess a bad game.
Having multiplayer might not be as attractive. Let me illustrate. For Sins, i have heard from acutal players in person and likewise from reviewers that for multiplayer experiences, it is simply too long to finish a game. In chess, a game can take hours to finish, and the tasks for each player in terms of what can be done with the individual pieces relative to game rules are fixed and the number of these type of moving options are extremely small. What i mean are there are the pawns, a king, 2 rooks, 2 bishops, etc, and they can move only in certain ways. And there are the only options with respect to each player. Take something like Galciv 2, you have an empire to run and the set of moves or the amounts of options are infinite per turn. Sooo it would take a long time for a player to decide a strategically sound move between turns. If you don't believe me, go play one of the avalon hill board games. Or ask any hard core table top war gamers how long they can take to make one move. I used to have a friend, he told me, for the game Third Reich. it takes one week just to decide one move. And third Reich is very similar to a 4x game except it is play on a table top. It is true that 4x tbs ocmputer games, there are a lot of automation due to computing processing power. But the complexity to make a sound decision remains. And the options that needs to be weighted are more than what can be offered in a chess game.
I know that one can play civ 4 has multiplayer, but to complete a game in a resonable of time is still not short. Try playing Sins, or starcraft, between skilled players, there are still rushing strategy being used, and it is being constantly being used, and a lot of the research options don't get done in a multiplayer game. this just shows that many people would rather have shorter multiplayer sessions and for galciv 2, that simply can't be done if you want a short game.