Hmmm.... This forum is mostly a collection of random people looking at random photos posted by random other people. Occasionally some of those random people will comment on said random photos. I'll take this a step further and suggest the whole process is... well... a bit random.
The thing is, none of it matters. Really. I'll happily concede that I spend more time on here than I should, but that's because I enjoy interacting here - even when I'm having a bit of a verbal spar with someone (which isn't very often to be fair). If I didn't enjoy it as much, I'd be off - there are other forums, there are other ways of communicating with people and I have other interests which could occupy my "forum time". If I ever felt like I was getting less back than I was putting in, I'd be away. But then maybe I'm selfish.
When people comment on photos, it's more of this random process above - sometimes you get an angry forummer who got out of bed the wrong side that day, who posts something pretty blunt. Othertimes you'll get someone who's just trying to be nice and encourage. Even if that ends in a "nice shot" hopefully there's at least something else more constructive... although sometimes there might not be.
So it's really just luck of the draw whether any one of us gets a "well that's frankly rubbish" type comment to something which is quite reasonable, or a "wow, lovely shot" to something which is distinctly below-average. I know I've felt a bit fed up when a photo I've posted gets no comments. Othertimes I've had plenty of feedback on something which I didn't really feel merited it... so it's swings and roundabouts.
I'd hate to think anyone spends their time here being marginalised or pushed away. But if that's ever the case then it's probably better they take a bit of a break and see whether they want to come back. The last thing anyone wants is someone feeling victimised or bullied - here or anywhere else.
I hope you stick around because it's clear that you care and forums such as this benefit from people who do just that.
And I hope you get to enjoy participating more than you have been!