Mods are busy people, they might not have the time to go through your posting history to find your posts that are of bad quality, but they will look at the ones that have been reported by other users, and if they agree that the posts are of pretty bad quality, then it'd be deleted, overall it is what it is, just work on the quality of your posts that's all.
Moderators do still check the posts before they are deleted, that is why some reports are marked as bad. If plenty people reported a post to be spam, moderators will still check it the post, that is there work. But maybe they may not check it thoroughly as usual if more of the same person posts are reported over and over again by several people. If more are deleted, that would result to temporarily ban. Moderators because of that are handling reported posts carefully.