Liam, . people post their stories there for variety of reasons - but most of them want and need feedback

ANY review is better then no review. Not even "I loved it' and "I hated it' are completely worthless.
Silence is the worst.

In depth reviews (and I've done my share of them) are great but no one can
expect many of those and some of them are just clever exercises.

Your opinion of the story has an equal weight as any other, no matter how you choose to express it.

I know that many authors actually went back and reworked their stories if
promised an upgrade in rating.

So, if you are in mood: do go and write some reviews. And: it is a good
exercise for budding authors,