It seems okay to me to be upset with the system and also point out the specific wrongs of companies in the right context. I actually think that's probably most effective. The person above specifically singled out Google as a reply to a comment praising the company, which seems reasonable enough. I guess you could get into whether it's a proportional response; the praise wasn't that high and also exists within the context of the system as you point out. Still, their reply doesn't necessarily indicate that they're not upset with all companies or the system.