Im afraid we never did get a sticky for things applying to Solo play.
House Rules Against AI (improving the AI)
http://forum.shrapnelgames.com/showthread.php?t=44783
Question Before Buying (is solo play any good?)
http://forum.shrapnelgames.com/showthread.php?t=45092
Both of those threads list many of the things that can improve the out-of-the-box AI (usually referred to as vanilla AI).
And both threads also save everyone from reposting the inevitable solo-vs-mp arguments.
You will find that both sides of that coin tend to no longer play the game in a purely vanilla mode. And its a tendency to compare the heavily modded of one, to the vanilla mode of the other.
