I liked that first ep for its visuals and overall shiny appearance.
But as Kraco mentionned, we won't get that till the end. I'm even wondering if we'll have much of the space humans, maybe to see them lose to the plants...
And if it's a slice of life, I wonder what we'll get on a rusty ship

Regarding the space fight, it's true that their all out attack was idiotic at best.
With their hyperspace technology, you'd think they'd be able to wipe solar systems with some kind of time-space bomb.

I was also surprised they didn't anticipate the regeneration speed of the giant canon. Sure you can always be surprised by a sudden leap in technology your enemy might have had, but an all out attack needs at least an alternative that should incapacitate your enemy enough so that you can at least retreat and organize the next battle.