I still enjoy Stellaris but I started a game as a race of Xenophobes who want to enslave/purge all alien races.
A reasonable start on my last game but all of my neighbours are now in a federation, so I can't attack anyone without going to war with about 10 nations at once. GG expansion!
They need to add some options for developing the stations/planets more I think, in EU4 you can dump extra monarch points/gold into improving provinces/buildings, I think Stellaris may benefit from such a system as well.
My biggest bug bear at the moment is that during war an enemy fleet can swoop in and destroy a planets space station before you can react, which is a right pain and they take ages to rebuild. Defense stations seem weak and you can't chain them near each other either, feels like localised planet defense is hard.
Tbink is you've basicaly became the nazis and are complaing rhe allies have ganged up on you
Defenxe stations need to be upgradable too