RE5 is the King of Modern RE in terms of .... well, everything, from graphics, to story, to weapons, to the tight gameplay, to features and to the Mercs.
RE4 in comparison is weak and outdated. RE6 in comparison is overly loosened, terrible gameplay, and story that is all over the place. The game cannot even decide if it wants to be action or horror, and felt so forced.
Bring back RE with 5's gameplay and CVX's atmosphere, and RE is gold again.
It definitely isn't better than 4, but it's a really good game. If they had just injected more horror (or really any horror) into this game, it would have been a great sequel to 4. But it's still a great action game and has tons of replayability.
"damn, it's like a disco ball's in front of my face!" -chris redfield