There's nothing wrong with venting.  I do it myself.  However, my personal belief is that everyone is not entitled to an opinion.  People are entitled to an informed opinion.

If the complaints were limited to "I don't like the bending methods" or "the map layout is dumb" or  "I don't like the way she looks" or other things where V4 is substantially different from V3 in an objective sense, or an opinion based on aesthetic values, well, that's one thing.  It's when they go on about stuff (like claiming it's significantly more expensive than when V3 came out) which are so clearly wrong that they should expect to get called out.  Stupid complaints just clutter the field and make it more difficult to discuss the legitimate complaints.