If you are applying to several different schools using one generic statement will be easily recognized and just as easily dismissed. WHY _ because you will be seen as not making an effort sell yourself to this particular school, low effort equals low interest to admissions representatives. Remember the admission committee will likely view thousands of these statements from qualified candidates and they will spot a weakness, flaw or lack of attention to the process in a heartbeat. What you don't want to do is give this committee an easy excuse to dismiss your statement and application.
Failure to comply with essay requirements _ Different schools will have different requirements when it comes to writing personal statements. Typical requirements and guidelines include the word count, number of paragraphs, fonts, document size, and deadline of submissions, among others. More than writing a personal statement that will pique the interest of your readers, following the set guidelines is no less important. By following correct instructions, you are essentially communicating to the selections board that you are willing and able to stick to the rules.