The review process has multiple stages. The first is an administrative/editorial review making sure the paper meets formatting requirements and is vaguely related to the area of specialty for the journal. At this stage the author's names do not matter since the person looking at the paper generally does not know everyone in the field. Really poor language very well may result in the manuscript being returned to the authors. At the end of this stage the manuscript is typically handed to the Editor in Chief or an associate/handling editor.
The EiC may also halt the process. The decision to precede at this stage might depend on the authors. If the EiC is unsure of the topic area, but recognizes an author that may help them decide on which AE to pass the paper to. A failure to recognize any authors and if the EiC cannot determine which AE to hand the paper to, may result in the manuscript being returned to the author or rejected. At the end of this stage the manuscript typically proceeds to the AE.
The job of the AE, at this stage, is to determine if the manuscript is worth the time of reviewers and find suitable reviewers. If the AE is doubtful about the manuscript, but recognizes the authors, they might send it for review while if they do not recognize the authors (or recognize the authors for causing problems), and the manuscript is bad, they might (and should) desk reject the manuscript. Typically, the manuscript then proceeds to the reviewers.
At this stage, the manuscript is reviewed. Sometimes the review is double-blind which means the authors cannot influence the decision, since the reviewer does not know who the authors are. Even when a single-blind system is used, the hope is that the authors do not influence the decision. That said, there is concern that it does, since double-blind systems are gaining popularity.
At all stages a poorly written manuscript can result in rejection and will likely lessen the quality of the reviews.