This is fucking awesome so far. I'm only through the first disc, but it definitely seems like it's up there with some of the best 90s sketch tv shows (Kids In The Hall, Upright Citizens Brigade, Ben Stiller Show, Mr.Show).
I have vague memories of liking it on TV when I was 10-11, but I didn't see enough episodes to make a deep impression beyond the opening credits and the talking sandwich. Viva Variety, however, I saw every episode of about 5 times. That was a heavy Comedy Central period for me.
So far, Showalter is the clear standout. Black is a little hit and miss so far, though I do like Captain Jack.