Play on the large maps (multiple stars, or 1 star but 40+ planets), 4+ AI on hard with pirates, teams unlocked. You'll have a great (and difficult) time.Awesome (and challenging) game in my opinion
Konnichiwa again!
at the start of a game, leave the option for teams unlocked
in the next screen give them teams as you like... in the long run you will loose possible teammembers cause their missions are generally "destroy x ships/structures of player b" ... most of the time player b is an ally/peaceful with you or its on the other edge of the galaxy, affording at least one interstar-jump
after some time, if you are unable to do this kill-missions they will be as low as 0% happyness. somehow it seems in the background, the AI's form own alliances against you. most likely you will have 3-5 enemies going for your planets at that time, depending on your work with pirates you will have another one.
the bigest problem on big maps, especially with more then one star is, the AI has time to build up while you pound one enemy into the ground they send their big fleets after your planets, beeing out of range for a fast strike into their territory