I would like to add this as well, and
@ThreePointCircle tell me if you agree:
On "magic" product, the physical side effects like jaw grinding and nystagmus are like icing on a cake. They add to an already full and complete experience. You feel AHMAZING and you LOVE everyone and now everyone is fluttering and that is even more amazing and makes you love them even more!
On "meh" product it is like the physical side effects are running without any of the mental rush/joy/love etc. So, your head feels almost sober, or a negative extension of sober. You are thinking about something like why people get cancer and then your eyes start fluttering and it is just annoying, like, "why is this happening?"
On a recent meh experience I had, I was hanging with friends in a hotel and we were playing stuff on Spotify. When I would go to play a track, the nystagmus would kick in and I could not see well enough to select the right song. It was just something that was in my way and getting in between me and my objective. Irritating.
Which brings me back around to a primary characteristic, for me, which is that a lot of things feel inconvenient or like an interruption on Meh-DMA. You're trying to talk to me? Stop. You want me to get up off the couch? No. I have to walk somewhere? Why? I'm starting to think maybe MehDMA needs its day to shine, by taking it alone with nothing to do and no one to talk to.