When Zero was first released in 2002 it was a moderate success because even though it looked quite stunning at the time the core design was outdated ... even then. This was partly due to the fact that the game was in fact originally designed for the Nintendo 64 a few years earlier.
The controls were unintuitive and the fixed camera perspective could be very frustrating. Zero was the first all new Resident Evil game since 2000's Code Veronica and many fans of the franchise were a little annoyed that the quirky issues were still rearing their ugly head, even after years of complaints. Opening doors for instance was akin to watching paint dry and when the characters climbed stairs you had almost enough time to nip downstairs and put on a pot of tea.