I have been rolling for 7 years now. My most sporadic usage is a few times a year, and my "heaviest" has been monthly, and only a couple of times have I used mdma two days in a row.
My comedowns have ranged from awesome and wonderful afterglow to downright dirty and nasty hangover.
I think the severity of the crash and comedown has a lot to do with your psychlogical well being at the time. When you are in a good mind I think your body is much more resistent to horrific crashes, but if you are already depressed, it may not take much to push you over and make it harder to crawl out of a bad headspace.