Have to say that I agree with Mostly Harmless. Negativity is probably the single fastest way to pooch an interview - and it's so unnecessary when you have a strong CV that shows good experience. A common interview question asks how you've dealt with conflict in the past, and more than once I've seen an angry or spiteful response to that question be the deciding factor against someone. You don't have to be a dyed in the wool butt kisser, but you do have to be respectful.