There are many arcs, and in-between thereīs self-contained "fun episodes".

For the record: The beginning drags a bit (unless you enjoy it as is, then good for you). Personally, I became a life-long Gintama-fan once I saw the double-episode 24/25, so Iīd recommend watching at least until then.

In the end, there are no bad episodes in Gintama, itīs just that you donīt know the characters in the beginning, so it may feel a bit too random. Power through and you wonīt regret it, guaranteed. One of the best anime series of all times. And the serious arcs feature some of the best fights, too.