The Toxicity of Microplastics Explorer (ToMEx) aquatic organism database contains over 280 microplastic ecotoxicity studies that have been scored for quality and applicability for risk assessment based on the quality criteria outlined by de Ruijter et al (2020). We used this data to assess the overall reporting quality of microplastic effects studies and evaluate the relationship between quality scores and various factors including time (year of publication), taxonomic group, whether adverse effects were observed, and if journal impact factor was linked to conformity with reporting criteria. Data uploaded into ToMEx were ranked for the conformity to quality assurance and quality control criteria and split into two categories based on whether the study reported the appropriate technical criteria and if information pertinent to risk assessment was provided. Studies reliably reported most technical criteria with the exception of background contamination, chemical purity, suspension homogeneity, exposure verification, and laboratory preparation. However, much of the data from studies within ToMEx does not support risk assessment criteria. Biological endpoints, food availability, and exposure time were the only criteria where most of the data met reporting criteria. Overall study quality and applicability to risk assessment has not changed over time (by year of publication), although a very weak (but significant) increase in technical quality over time was observed. We also found a very weak (but significant) positive trend between study quality score and journal impact factors, as well as a weak (but significant) negative correlation between quality and whether a study found a significant effect at any exposure concentration tested. Quality score does appear to vary significantly depending on study organism, with fish studies generally having lower risk quality criteria scores and algae, annelids, crustaceans, and mixed community studies generally having higher scores. This analysis highlights uncertainties underlying the current state of knowledge of microplastics ecotoxicity, data gaps in the microplastics ecotoxicity literature, and provides a framework for assessing aggregated ecotoxicity data quality and its applicability to risk assessment.