They do seem to be much more effective at motivating "scout" and "raid" than they are at de-motivating "blob". People generally just do what's necessary to restore their ability to blob.
Need to give some feedback here
AI Eyes have 400m HP. Shield Guard Posts, MKI has 300-400ish million, MKIV has 760. Just pointing out that in order to get rid of Eye, minimum damage done required is 400m most of the time (given that there's no Shield Guard Posts). And if I send a fleet, possibly Eye will start spawning. And I'm not a blob guy anyway. If I send all bombers, they have to ignore other stuff, and die while shooting at the eye. I don't know how people plays this game, but I'm 10 hour into my game, and still have single planet (well, this is a first for me though, I choose high-priority targets first, never touch the rest - although, this is the funniest and best game I ever had
). And I cannot use any guerilla tactics, hit and run in other words, due to low resource income. Yes, I can research harvester MKII and such, but military & espionage always comes first for me.