So do I.
Almost every episode is full of laughs and true stories.
And yes, there are some arcs, but they only span about 3 oder 4 episodes.
Gintama is a comedy show most of the time, but sometimes it changes to a fighting show, a horror show or whatever, and I think it does the transitions quite good.
There seems to be some overall plot connecting most of the arcs - but it's not too obvious in most of the episodes.