I actually dropped Gintama when it first came out. One or two episodes in. I was checking out most of the new releases and it made me laugh, but I didn't stick with it. I actually picked it up again after seeing a picture of Gin talking about Strawberry milk that made me laugh. This is one of the funniest anime I have ever watched and has one of the best main characters I have seen in any show.
tl;dr keep watching until episode 14 - if you don't like it drop it.