Yea the pirate system feels pretty good to me at the moment. I have been able to defeat them with fleets of decent size with out too much problems in the early game and was tempted enough by their strength in the late game to build Novaliths to end the bastards lol The only thing I feel is slightly out is the pirate fleet levels (i.e. Elevated, Guarded, etc) seem to rise pretty swiftly even on a 1v1.

But generally they have been much easier to deal with early game and still tough later. I also saw a small pirate fleet hit one of my worlds reasonably late in a game due to the fact no one had bidded on them. So when the cash disappeared, pirate raid strength did too which was nice.

I had a early large fleet attack me when I defeated them, here came a second fleet   but it was only ship and didn't seem know what to do. It didnt attack or move just sat there. Through whole game I would get only one ship pirates every once and while.

Has anybody had a pirate attack you and then leave for unknown reason?

I see, so if the pirates attack something like my trade port and when they destoried it, they leave. That's kool!

I would just like to see 2 changes.

1.) Make them to attack all players with bounty on their heads.

2.) Enable them to bypass fortified system and attack "soft" targets.

Their weapons are good and they do a lot of damage but ship hull and armor are weak even late game so 1 SB and planet loyalty can effectively defend planet from all their attacks. So they become exp feeders and resource givers in casa you are playing as vasari.  + instead of attacking structures aka soft targets they attack star basses. 

Agree with this. Pirates prey upon the weak. Having them go kamikaze at starbases and defenses is lame and not very lore correct.