Whenever you see this sort of thing, please feel free to flag one of their posts for moderator attention and ask them to look into the user's review history.
The site diamond moderators have the ability to investigate these incidents and, if there is any indication of poor behavior, ban users from review. These bans generally start at three days and can go up to a year or more. Hopefully the first request to take more time with reviews will change the behavior without requiring a longer ban.
As to other solutions, in most cases, a single user doing a poor job of reviewing won't be enough to do too much damage. The queue that requires the fewest reviewers is the suggested edit queue which calls for two "approve" or one "improve edit" vote.
For those not sure how to properly review posts, there's a guide on Meta Stack Exchange that might help. The most important thing to remember is to actually read the post and judge it on its merits: If it needs editing, edit; if it needs to be closed, vote to close; if it needs to be removed, recommend deletion. Keeping the site clean and neat is an important part of every site's moderation and we hope users will take those moderation tasks seriously.
This can be easy to miss, so thanks for pointing it out.
