Basically, my TEC fleet has invaded an Advent planet and their fleet immediately escaped to the next adjacent planet, and im thinking, 'hmmm maybe il just wait for their counter attack, and just stay at the ready'. After 10 minutes i get bored and decide to send out a scout to their planet. All of a sudden my scout detects 200 ships ready to phase jump (you know, all lined up and ready to go) then a second later my scout gets eaten. So i decide to wait fot the counter attack and successfully intercept them fools, but no...another 10 minutes has passed and i get fed up and colonize the planet, out of curiousity i take the existing fleet and go to that planet. So we arrive but when im there, all i can see now is a few disiciples and trade ships, so i think to myself, WTF?! Either they've gone around the star system to catch me at the other end or they've retreated for some absurd reason.
Eventually i found out that they retreated, and i got them from both ends, and KAboom!
Becuase of that mistake, the rest of the game was way easier then i thought
and i was expecting some sort of challenge ;( but the undeveloped AI gave in 
