This paper shows an example of integrating the CoRubric assessment tool in an experience of designing gamified resources in science education with 43 pre-service science teachers from the University of Malaga (Spain). Participants had to design a gamified resource to teach science to secondary school students and explain it at a science fair. In addition, they had to design an e-rubric to evaluate the gamified resources made by their peers. Participants could improve their e-rubric design throughout the experience; on the one hand, by comparing it with that of their peers and, on the other hand, after attending the explanation of the different resources. This work analyses the participants' perceptions of the design and use of e-rubrics, finding significant progress in their design and gamified resources. Also, emotions of interest and concentration emerged during the experience.