Well, talking about percentages brings up a lot of issues. OK, maybe once everyone calls out sick so service is bad, maybe once the cook had a family tragedy and their game is off.
But when I go to a doctor, I don’t want to talk percentages. If he cuts off the wrong foot just this once, I’m not happy. When dealing with food, there are issues of vermin, roaches and food poisoning that are inexcusable. Even once.
Sometimes the place is filthy, or there is a general lack of concern when something is wrong. I’ve had servers fight with me like I’m their cheating wife when I have made polite complaints.
As for online blog reviews, I go twice – if one time there is a problem with service or something minor, I go a third time for a tie-breaker. But I also consider the freak things that happen and no one can control. I’m not going to slam a place because they forgot to put in my french fry order one time. I consider that servers and cooks are people who also have bad days sometimes. That is different than the restaurant as a whole being bad.
Also, if they serve breakfast I often make another trip just for that.
After I have finished my review, then I hit the blogs and forums to see if others share my experience. I try not to beforehand because I don’t want to have preconceived notions. Usually if service is rude or slow, food is cold or improperly handled, there are dozens of similar reports on the boards.
I try to only write "recommendation" reviews. If I don’t like a place I normally leave it to die on the vine.