Gimme happy scifi, gimme sad/angry/depressed scifi. All I ask for is good stories.
And some sublety and layers to give the characters some "reality".
For me, RDM's BSG gave me that. The original...was much more hit or miss, but I'm still a fan and hold there is a reason it has not just fallen by the wayside.
It does not have to be an either/or proposition.