I think the reason for "hate" is because so many people loved RE4 and now with RE5, any little change might be looked upon negatively. One thing I noticed between RE4 and the demo of RE5 was that 4 was very simple in play control. 5 seemed a little more excessive in play control. Although I only played the demo once so far so might be totally off.
I think another reason is because 4 came out exclusively for Nintendo for almost a year before the PS2 and now, Nintendo's big system isn't getting 5 at all. Nintendo fans keep seeing their system overlooked again again by many of the big hardcore mainstream titles. I fel that way for a while and I realized I would need an HD system so I picked up an Xbox 360. It makes me resent the fact the Wii misses out a lot less. It also makes me question though if I'll buy a Nintendo system first next gen if it's a repeat of this gen.
I'll come up with something better eventually...
