Are critters or critter meat needed for anything important in the game or can they just be ignored?
They are a pretty valuable trade good if you know who to sell them to
You can sell them at certain alien traders for RU. I like to stun critters and sell them because they give more RU than most mineral types.
they might be valuable, but the return rate for the time spent is abysmal.
I don't even mount turrets of any type unless a mission requires them.
There is one minor quest that requires a creature be killed or stunned, but in general the answers above are correct.
The ones that sell for 200 RU, and some for 100 are good. Others I kill when bored
If you care about Steam achievements, there are a few that require killing and capturing critters.
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