[ido]

    I just don't think others' opinion on ideas 
    are particularly relevant. My opinion on
    Dropbox/Heroku/AirBnb's ideas would have all 
    fallen on the left side of the bell curve, 
    which only shows my opinion on ideas is 
    irrelevant.

I think what you are trying to say is "take advice/opinions with a grain of salt".

I've recieved plenty of bad (and good) feedback on products that ended up being successful, but if someone who is considered a world-renown expert in my field tells me I have problems A, B & C I'm going to listen carefully.