Yeah it's really good to gauge the quality of a product and or if something is too good to be true. Sometimes you got to weed through the idiot 1 star reviews and also the idiot 5 star ones that say something like 'It came in 4 days, very quick!' and it's like you're reviewing the product not the shipping speed that the seller has no control over.I do if it has a lot of 1 star reviews and people are warning of a "Scam" than thats when I take it seriously, mostly when it comes to products.
In general just remember at the end of the day Reviews are all opinions. Not everyone is going to agree on what they think is better or worse. I don't read reviews because I like to go in with a open mind. Thats mostly whenever a new game is out.