What are the guidelines for reviewing?
What should one avoid doing when reviewing?
How can it happen to be banned and what are the implications of this?
The site offers several review queues that make helping to moderate this community more streamlined. For details on these queues see What are the review queues, and how do they work?.
When you decide to review please do it in that spirit of helping to moderate this community.
Do not turn it into a game or a competition. Yes, there are badges, stats, and leader-boards but don't make performing well there your objective. While it might seem harmless, empirically it is very hard to avoid negative effects on the quality of reviewing and it can create conflicts.
Do not rush it. Some care should be taken when evaluating posts for review. Yes, if one is used to doing it some posts can be evaluate quickly, but still please be diligent.
One more point that might not be obvious.
Reviews should be conducted in line with MSE's community standards. This means you should not (a) ignore rules or guidelines for questions you like, or (b) close questions that you dislike, but do not violate any rules or guidelines. For example, if you consistently vote to leave open questions with insufficient context, your review privileges will be revoked. On the other hand, if you consistently vote to close questions simply for being low level, your review privileges will be revoked.
On the site itself there is more leeway but in the review queue please try to take a middle of the road position. If you don't want to do this, or don't know what this is supposed to mean, that's not a problem, there is no obligation to review.
Do not cherry-pick via skip. If you review, please, try to review the posts that are presented to you. Of course sometimes one feels badly placed or unable to evaluate a post. Then one should skip. But skipping through the queue to find specific types of posts is not really in line with the ideas of the queues.
Failure to comply with these guidelines can result in a review-ban. You then will be blocked from reviewing for a certain period of time. Other than that the site can be used normally, this is not an account-suspension.
The decisions to review-ban are made by the moderators. We have a set of indicators and thresholds, and discuss it in cases of doubt. As any moderator action, these decisions can be questioned.