The "Harry Johnson" series. It started out as a fun if not necessarily straightforward "oh my God, look at how overpowered everything is, especially Harry" work, and then lost me a couple of stories down the line after somewhere between the third and sixth consecutive time Harry argued in support of slavery and won - not only because "I'm incredibly powerful and I don't care", but because the person he was arguing with (who was effectively becoming a slave, in a context where "voluntary" is decidedly ambiguous) apparently couldn't come up with any arguments to refute him.
Frankly, that turned me off of almost everything by the same author, largely because most of it is technically a single gigantic megacrossover and the likelihood of needing to have read "Harry Johnson" to understand some events or references in other stories seems quite high.
Frankly, that turned me off of almost everything by the same author, largely because most of it is technically a single gigantic megacrossover and the likelihood of needing to have read "Harry Johnson" to understand some events or references in other stories seems quite high.