Only Resident Evil game I've played using a keyboard was 4
6 is hard to play on the keyboard for me given the amount of sliding and quick dodges you're doing which use a lot of separate buttons. I just think some games are better suited to a controller, specifically combo/movement heavy games, although move/wii/hydra support would be the best way to play I think.
Revelations just has a simple dodge though so I imagine that would be much more easy to play using a M&KB set up, although as you mentioned it does make aiming quite easier. Suppose it can make things less tense but it's so much more smooth which is nice.