The language is a bit hard to get into at fast, but then becomes easier once you get into the grove of reading it.
It contains tons of thought-provoking themes on society, especially nature vs. nurture.
For me, "Those Extraordinary Twins" is probably the most hilarious part of the
Pudd'nhead Wilson' storyline. That farce is worth a read because it seems quite outrageous and unbelievable. Still, it's stories like those that make me fall in love with Twain's writing.