MP is functioning fine now, and it's a very appealing game.
async MP plays and feels like solitaire though.
without log or replay we get not the slightest idea what might have happened in opponents' turns
but that's a minor plaint and no reason to not play a tourney
this quote from Neumannium's Race for the Galaxy article is a perfect fit for Potion Explosion as well:
"one of the games to coin the phrase Multiplayer Solitaire. Still, playing your (hand)/turn skillfully is quite the puzzle to unravel and should give (strategy and) tactics lovers a go for their money."
well, not nearly as deep as RftG of course.