It is basically a consistently funny sketch show. If ever there were an elusive creation, that would be it: consistently funny sketch comedy. Almost every skit is right on target, hilarious, well-acted, and well-paced.
His voice has the ability to make me instantly want to smile. It is reflexive at this point. The sound of his voice is irreversibly linked in my mind to happiness and laughter.
YES! However, I love to simply relisten to favorite pieces as well--I can't refrain from sharing them with just about anybody I can get to listen (anyone who has needed a car ride from me in the last eight months is now very familiar with John Finnemore's comedy shows, both souvenir programme and cabin pressure)
Listen to it! It will be one of the best choices you could possibly make for your time.