Personally, the reason I'm lukewarm about Farmer's Market is that it seems to be neither strong nor fun, hence more trouble than it's worth.
It reminds me a lot of Agricola - which is a game many people seem to adore but I dislike intensely. It's fine if a game lets your opponent(s) thwart your strategy by strategically throwing spanners in the works, but it annoys me if you can be seriously messed up by what your opponent does without them intending it.
Sod's Law dictates that if you want coin, Farmer's Market will trash itself and give you 4VP; if you want VP, Farmer's Market will give you coin. )-8