For authors faced with questions about the reputation and ranking of JMIR journals, the following may provide evidence that they are top journals: According to a survey among 398 health informatics experts who are asked to rank the top health informatics journals by Dohan et al (1), JMIR and it's (then) 2 sister journals JMIR Medical Informatics and JMIR mHealth were all ranked in the top tier, namely in the A+ (top 5%) and A (top 20%) tiers.
1. Dohan, Michael S.; Serenko, Alexander; and Tan, Joseph PhD. The Expert Survey-Based Global Ranking of Management- and Clinical-Centered Health Informatics and IT Journals Transactions of the International Conference on Health Information Technology Advancement. Paper 45. http://scholarworks.wmich.edu/ichita_transactions/45