This -by the way- is the Movie, not the Series.
Why is it dead boring? First because if one divides the story into 20 parts, then 17 parts are filmed in the bedrooms, 1 in the doorway to the bedroom, 1 in the street, and 1 in the forest. Where is the wild west there? Mr. SpongeBob SquarePants only knows.
Second, everyone would expect a little bit different English language (or slang) than today in the American west during the late of the 1800's, but surely no one expects that language to be "Shakespearian" in the heaviest theatrical mode.
Third, conversations take forever and ever and ever.
And here is the conclusion of this review, it is a 17/20 parts of bedrooms diluted conversations.
Boring.