I never had bad feelings on MDMA, or afterwards. No comedown either, on the contrary, plenty of afterglow. The interpersonal variability of these experiences is amazing.
The day after taking LSD on the other hand was a great. Was very productive and motivated.
To each their own.
EDIT: Important to note than I'm never active on MDMA, always a couch potato so the feelings of lethargy may differ.