Re 4 is one of my favorite games, not sure why but it has something to it that makes is really special.
I played all and owned all RE games for PS1 and GC, PS3.
Re 1 and DC were really good. The remake was amazing and gave me the creeps cuz of the crimsom and specially Lisa...traumatizing lol.
Re3 was the most scariest because i was constantly harrased by that ____er lol. i loved the puzzles the RE games had back then. nowdays most games lack that because they are more action oriented and graphics, cameras and other controlers and interfaces allows for a more fast paced. back then puzzle made up for all those other things that we can do now with videogames in this age.
RE5 I like, specially the gold edition. I think that the evolving of the virus in to a more life form is a good step to not bring the same formula of dull zombies but in another country. now back to re6 with an enhaced zombie virus that has the mobility of the plagas and the looks and properties of the classic G and T viruses, bringing all the char from previous games (almost except jill, claire) I think is a bang!. amazing. a great culminative climax.
I believe Re 4 and 5 were needed in order to buiild the story to re6.
if re 4 and 5 would have been umbrellas alone doing and same t or g or whatever virus, there probably wouldnt be a re 6.