This is a show written, and performed for a very select audience. Everything in the show is so precious, and is meant to elicit "Ahhh"s and "Teehee"s as opposed to genuine laughter. This is a show for people who wear glasses with lenses that are just glass and only there as an affectation. It's a kitsch show and nothing more. If you like this show, good on you, many of my friends do, though the ones who do are all girls. I was raised on Mr. Show, The Kids in the Hall, and britt stuff like Big Train and Brass Eye. Those shows were are clever and meant to be laugh out loud funny. Portlandia, is a lazy, masturbatory in joke for hipsters, to fake laugh at, and pretend they are both the butt of the joke as well as in on it. For me, this show is painfully unfunny with actors trying way to hard.
On a positive note, it does have some decent production values, and often the cinematography is great for a sketch show, they should have invested more effort in comedy than in the aesthetics.