Depends on the series and it depends on the developer. I preordered Revelations because I loved the other AC games and I want to see this series through to its conclusion. I also pre-order Valve games because even though I was never a HUGE fan of theirs, I trust that their product will be unique and at least a worthwhile experience to have.
I'm always wary though. I loved Bioshock and the sequel was the BIGGEST disappointment. So you can't always trust that a series will continue to be decent, let alone good.
I'm always wary though. I loved Bioshock and the sequel was the BIGGEST disappointment. So you can't always trust that a series will continue to be decent, let alone good.