First off I only played with Vasari so I can't comment much on other races.

1. The Vasari star base starts attacking before it's built.

2. When I try to scout enemy mines, they flicker between invulnerable/vulnerable, which makes mine clearing a HARD CHORE because you have to babysit you forces into moving in and clearing them manually.

3. Mines are OP, with just a couple of minelayers I stack an entire orbit with mines with no restrictions.

4. Don't know how or why, but it happened to me several times when I make a stabilizer on a newly-acquired planet, I can't use it for some time.

5. Game has a memory leak and if I try to load I crash 80% of the time

6. Offensive mining. I don't know has it been explored (or intended), but I have much success in bringing my minelayers with my attacking force and laying mines around enemy ships and structures.

7. I really think the Marauder could use some help, I tried rushing with sabotage and it wasn't particularly effective, phasing isn't bad but it's too defensive, and the speed thing is meh. Furthermore, his ult is less useful now that the cannon forms a stabilazer on the planet you shoot.