A good thing is that the AI appears to be thinking. If you take locked teams and have allies, they'll try to help you as long as they're strong. In fact, if your teammates stay alive because the other AIs in your system are busy with you, your ally will eventually have several battlegroups going around - a bunch of cruisers and maybe a capship each.
One time the pirates made it all the way to my homeworld with minimal damage (didn't build Phase Disruptors this game), and I totally forgot to build much defense on my homeworld, or even develop the Tactical, since I'd been conquering AIs for a few hours.
I started cranking out Kodiaks as fast as I could, and got a planetary shield up (the pirates had 7 Pillagers among others), and then my ally comes rushing in with about a dozen cruisers - Hoshiko, Perchirien, Cielo, and Kodiak, and a few Cobalts. I met their fleet halfway by nailing the pirates from the opposite part of the gravity well, since my light factory was on the other side, and some of my Kodiaks started to hammer their pillagers.
But the AI really helped save my homeworld. This shows that the AI is thinking about important things to do... and if it happens to have a well-developed position, with a lot of resources and fleet capacity, it will be able to do some of those important things. Like defending its allies' homeworlds.

The AI isn't always the most intelligent, but sometimes it surprises you. Just don't make it any dumber.

They even seem to be capable of anticipating an attack; on more than a few occasions when invading an enemy AI with many planets, they'll have a huge fleet, with frigates and capships, ambushing my forces as soon as I jump in.
Another thing you shouldn't change is the laptop-friendly controls. Keep those zoom in/out and rotating functions nice and convenient for those who don't have access to a scroll wheel!