Massive Open Online Courses (MOOCs) have recently gained popularity in a blended learning approach at educational institutions around the world. Despite this trend, little research exists on the students' experiences and emerging challenges with implementing this online learning platform in a higher education setting, particularly from the Malaysian perspective. To address this need, this study was conducted to evaluate the usability of MOOC-OpenLearning based on the undergraduate students' perception of it. Utilising the quantitative approach, a survey was disseminated online to students in various undergraduate programs in a public university in Malaysia, Universiti Tun Hussein Onn Malaysia (UTHM). The study findings revealed a generally moderate level of positive perceptions among the respondents towards all the usability aspects of MOOC-OpenLearning in supporting their learning process, i.e., in terms of usefulness, ease of use, ease of learning, and satisfaction. An implication of this study is that respondents have significant uncertainties towards the usability of MOOC-OpenLearning and the emerging challenges of using it may require further exploration.