I live in England so UK comedy isn't novel to me but even still, Taskmaster feels like the best original show in the last 20 years. Aside from the comedy, there is a lot of interesting game design. Many episodes feel like a series of WarioWare minigames. In many cases the rules are only there to encourage contestants outside the box thinking and creative solutions. Casey said it a lot better than I could, so go read his GOTY article linked above.
Who else enjoys the show? Which is your favourite series? Also, why was the (cancelled) US version so terrible? Despite friend of the site Ron Funches being on there (which is dream casting for me) I couldn't stand more than 10 minutes of it.
For those curious, Taskmaster is available on their youtube channel for people outside the UK, and on All4 for UK viewers.