it would be the first step to not let them walk right into your base and be killed by the towers! cant think of a dumber behaviour.
what skill level are the ki guys anyways? i would think of them being "easy"?!
or let them go back if they encouter 2 enemies...
some small behavioural changes and they wouldn´t suck that hard, but i agree with the writers above that they probably will never be a real challenge.
but at least the developers should try (after fixing higher priority issues). maybe if they fix the rankings or develop something new, it would not be necessary to play with ki...? 