The Greek Asylum Service is regularly sharing statistics about how likely it is for certain nationalities to get an asylum status in Greece. For nationals of Syria (99.6%), Yemen (97.8%) and Palestinians (96.1%) the chances to get asylum in Greece are continuously very high. Also for asylum seekers from Iraq and Afghanistan the possibility to receive a status is quite good. 7 out of 10 asylum seekers are receiving a status at the moment. Iranian nationals have an acceptance rate of 59.1%.
The recognition rate for other countries is unfortunately worse. Only 1 out of 8 Moroccans receives an asylum status in Greece (12.5%). Nationals of Egypt have a recognition rate of 7.3%, nationals of Bangladesh of 3.5% and nationals of Algeria 3.3%. For Pakistanis the recognition rate remains also very low (2.4%). That means, if 40 Pakistanis apply, in average 39 will be rejected and only 1 will get asylum. Please keep in mind that everybody is allowed to apply for asylum. Your asylum decision will depend on the personal reasons why you fled your country of origin. While it should not depend on your nationality, different nationalities still have different chances of acceptance. Preparing for your interview can increase the chances of actually getting an asylum status. You can find this and other statistic here (only in English).