OK, played for an hour or 2 with my son and we had a blast (pun possibly intended).
After he went to bed I spent a couple of hours dropping in and out of various games.
What I like:
Each 'mission' runs 5-12 minutes
Each planet has 2 missions (there are tons of planets, and regardless, maps are random generated each time)
There's overall continuity with far reaching objectives (conquer enough planets to make it to an enemy homeworld for an assault)
You can play solo and run about with your tally counting towards the overall goals.
You can just 'drop in' on a random game or two, then leave with no problems or penalties.
What I don't like:
I dont like people dropping things on my head from orbit, but it is a good laugh and part of the game.
Seriously, there not much not to like - its a fun 2, challenging 2 stick top down shooter.
This was a good purchase. And for $40 with all DLC and unlocks can't go wrong.
"Rarely is the questioned asked: Is our children learning?" George Bush, Jan. 11, 2000