I didn't think it was horrible per se, but it did feel like an episode of a wholy different series, and I felt it pretty much made the last few seasons pointless.
I don't know, there was a tonal shift there that didn't sit well it me at all.

Just to be a bit pedantic: no penguin species lives in a arctic climate, 'cause the Arctic is in the Northen hemisphere :p
Correcting your correction: true, most penguins don't live in the Antartic...but neither do a fair number of their predators. Hell, you won't catch a sea lion anywhere near the poles! There's…