We report the results of a systematic review of learners' experiences and perspectives in massive open online courses (MOOCs). This systematic review includes 51 articles published between 2008 and 2021 that appeared in top educational technology journals. Each article provides insight into the MOOC learner experience, and our analysis identified three themes: motivation, course engagement, and satisfaction and achievement. Our study identifies three implications for MOOC course design - clear course structure, engagement among learners, and learner-centered. Understanding the differences in learner motivations to enroll in a course necessitates careful consideration of learner experiences within MOOCs. This systematic review provides valuable insight into how learners' experiences are captured and used to influence course design and evaluation.