You are supposed to evaluate each speech from its content, organization, supporting details and etc.. You can also comment on each speaker's delivery, language and other presentation skills. But you need to know those are not of primary importance. Please remember, this is an written task, so grammar mistakes should be carefully avoided. If too many grammatical mistakes are found in your writing, then your paper will be bounced back, and you will need to re-submit your paper. Any re-submitted paper will receive a score of no more than 80. So please be careful with you writing.