Can't speak for others, but I think the paintwork looks patchy and unsmooth. Look at the shield on its left chest, for example - just above the crest is an area that is patchily black. That doesn't lend itself well to creating an illusion of depth or coverage. The patchiness makes the whole dreadnought look unfinished. If you're going for the weathered look, there's a lot of tutorials here that cover different techniques in great detail.
Also, the shield crest, in particular, looks especially dull. There's none of the brightness one would associate with well-done metallics, for instance. The skull also looks painted a uniform shade of gray, without any shading nor highlighting.
There are a few nice things about the dreadnought which I like, though: you've got edge highlighting, for one. I think the hard edges could be softened and blended back into the panels, which would make it look nicer, but that's only my opinion. And you've got soft scuff marks all over - especially prominent on its right shoulder, which is a nice start to weathering.
The fig would probably look good at 3 feet or more, which is definitely table-top worthy in my book, but more than that ... sorry.
Besides, no point in feeling miffed - you did have fun painting the dreadnought, right? That's what counts. You'll even that ranking out at around 50+ votes, which is a truer indication of the ranking. Besides, it's a tough crowd here on CMON. Lighten up - keep painting, keep trying out new techniques, and eventually you'll improve. Some of the other painters here took more than a while to breach the 8+ barrier.
The most important thing is - paint for fun!