It may be beyond some people's self-control ability but it is certainly possible to adequately reflect ones negative experience of a golf course without making it insulting, dismissive or turning it into a beat-down of the architect or course owner.
That said, if you played a much looked forward to round at a course of good reputation and found it a thoroughly miserable experience with no redeeming features it would probably be gentlemanly to limit your comments to a basic statement that you didn't find it to be something you could recommend. I mean, if it seemed that bad to you how much could be accomplished by listing 20 or 30 things that are wrong with it and going off on a tirade about how overrated it is in your opinion? Past a certain point, you wouldn't be able to notice a redeeming characteristic if it bit you on the ass.
I must say, though, that I've never played a round at a highly recommended course that wasn't at the minimum pretty darned fun. With my game, I just can't reasonably be all that hard to please. I'll mention one disappointment, such as it was. I played in the King Putter festivities the year it was at Stevenson Ranch. There are some interesting green countours and generally a good job of tying greens into the rest of the hole but the constant enroachment of unplayable native grass areas and the overall flatness of the course made me quite glad that I was there with a big group of friends so the competition and social elements were top notch. If I were playing there by myself or with a random group of strangers it would have seemed pretty ho-hum in total.
Now see? That's a fairly negative summary review yet I can't imagine that the course's architect would want to go home and kick his dog after reading it. What would be gained by making it sound like I had wasted three days of my life playing a dog-track that should be bulldozed to make way for pasturing cows? There is a tendency to hyperbole and exaggeration in both positive and negative directions in Internet discussions. We just need to avoid exaggerating our negative experiences, not self-censor them altogether. And it would perhaps be good not to go too overboard when we have a good experience, either.