having more of the same sometimes isn't necesarilly a bad thing.
Zelda Oot and MM looked EXACTLY the same in screenshots, there was not a single upgrade in the gameplay mechanics ( time limit aside ) or anything, yet both games rock.
Metroid Prime. 1 and 2 are EXACTLY the same just with different scenarios/stages, both are awesome.
the backlash and relative hate come from the fact that only 2 years are apart the N64 zelda games or the cube metroid games. Re4 is so good, I have already played it like 20 times because of the lack of a proper sequel. til march 09, that's 3 years between 4 and 5,not much but I am fed up from 4... I understand when people aren't trilled with RE5...
even then, you guys are being too pessimistic, RE5 will be awesome. Yes it will be the same gameplay mechanic but its RE4 it's copying, not some shitty game... give it a break, and let them just add new stuff like different guns, unlockables, stages, bosses, the formula has only been used once so this time, JUST this time I am not upset it's RE4 on steroids.