It's not safe out there...

This is crazy dude! But fun. From my current game. I'm the purple guy, a custom race with mega social and military buffs, and medium economy buffs. I put a lot of early tech effort into buffing those stats even more, with the result that a lucky homeworld placement saw me taking a great deal of territory.
Later on when my situation matured, I knew the galaxy was in turmoil, but didn't know the extent of it until the big 60s (sensor barges) powered up. zomg! Very cool!
A couple of points for feedback though. You can see I've highlighted my current area of operations in purple (center map). I have about 4 or 5 capable combat ships in that area. So far they haven't had any trouble at all contained the massive influx of enemy ships (I am at war with nearly everything thanks to an alliance with the Torian Confederation).
Doesn't seem very realistic. But then again I suppose, and this is the point, that dealing with enemy ships on an individual basis as I have been doing is acceptable. That's the problem; the enemy do not usually create feelts and if he does they are comprised of ships I can beat easily. The ship you see in the lower right corner is a small hull with the stats shown lower middle. It isn't super powerful but is rather just adequate. Sometimes I lose hitpoints in a battle

This situation isn't helped by the fact that the yellow Acrean guys seem to have a propensity toward tiny hull sizes, resulting in slow and weak ships even when occasionally grouped into 6-ship fleets.
Now admittedly there is a buttload going on in this game. I don't know how the AI works but I don't think it can be distracted by the number of events like a human can, so I kinda expected more from it - then again maybe it has rightly concluded that my tiny yet capable force just isn't worth worrying about at this stage. But is that correct? I have successfully invaded 3 Acrean advance planets and decimated more than a 3rd of their military capability. If I were the Acrean's I would be impementing some rather severe upgrade measures very quickly.
Maybe the yellow ships further away are more capable - I haven't checked. The only adaption I've seen and it's a clever one - is the inclusion of armour on the Acrean Defender ship. This design actually gives my pictured design a run for it's money. Their "attack" style ships - arguably their most important - will be summarily vaporised if they venture within the range of my interceptors.
Another problem you might have experienced and which is shown on the map here, is the placement of troop transport ships. No invasion can proceed without these vessels but the AI is throwing them around like so much bird seed. They often travel unprotected and sometimes at the head of the conga-line streaming in from the enemy homeworlds.
I think this scenario is where the otherwise well thought out logisics system could be breaking AI (and maybe human) invasion efforts. I suspect the AI just can't muster enough logistic points to create a well protected invasion fleet. Sometimes they travel with one tiny ship, but most times the AI appears to be zerg rushing transports through enemy space.
The above situation is probably related in some part to the point I made about the AI not adapting to my ship design, but it also has a lot to do with intellegent selection of target invasion points. The AI seems to be rushing headlong into a maelstrom, and worse still is doing it one poorly designed unit at a time.
Case in point - about 4 AI planets have changed into the hands of a rival AI, desipte the gigantic mess you see on the map having been raging for many turns. The Torian Confederation (green) hasn't lost a single colony despite being the least powerful major race. The minor races seem to suffer a bit but that's only because they don't have the industrial capacity to mass produce. Still, they somehow manage to avoid the worst of it.
However! Bloody awesome stuff regardless!
