We need more ratings, not less. Well, at least I do.
I've rated plenty of anime with 7, but when I compare any two of them, I can definitely say which one was better. None of them are good enough to rate 8, but there are some that'd reserve 7.5, while some others should only have 6.5.

Half-scores would improve the rating accuracy -- for me, at least.
...and to you, o unbeliever who says that no anime deserves less than four, I say go watch Sailor and the 7 Ballz.
That anime aside, if I watch something that makes me so ill that I damn near

, I should bloody well be able to give it an abysmal score.
(Err... DonGato, I hope you don't mind me (ab)using your smilies...
)