Well the cannibals for one.
Yup.
Markarth has:
- svck ass Jarl, both of them.
- Corrupt guards.
- Inhumane prison system.
- Most ignorant, stuck-up inhabitants in Skyrim.
- Forsworn Terrorists.
- Even the damn barmaids want someone dead.
- The temple of Dibella is boring as hell, in contrast to what they were in Daggerfall (

) and what they're hinted to be by NPCs.
- Silver-bloods, which are more arrogant than the Black-Briars could ever hope to be.
- Cannibals.
- House used to worship one of the worst Daedra, in middle of the whole damn city and no one cares.
- Forsworn Conspiracy is by far the buggiest quest in the game.
What else? The list could go on and on and on...