Just responding the OP, kinda but not really. Usually its somewhat significant if its mass praised, or mass panned. But I can't think of one single instance where any critic has either changed my mind on something, or made me want to buy or not buy something. I think a lot of critics think much more highly about themselves than they should. Or to convey, how they felt or their opinion on something, instead of saying 'this character was bland, the writing was horrible' without citing examples or how to improve on it.
I also kinda am in the camp where I wish critics were people who excelled in that field. For example, when it comes to music, someone who I know personally has a lot of knowledge tells me something is good or bad, their opinion is weighted more because they're more intimate with the details of what they're talking about.