Nobody minds a technical critique. Something specific - something informed and detailed that allows viewers to make a comparison or determination for themselves. Something that engages the intelligence of presumably intelligent viewers.

Pretty much everybody minds a generic and aimless slap at a product.  Basically chance for personal expression for the venter, but a waste of forum space and time for everyone else.

No, that last was not correct. An aimless slap at a product is good news for other people who "hate" a product as well. Encourages those folks, so in that, it is a good post.