Pennies make pounds
Perhaps the biggest underlying problem with free-to-play is that games developers are slowly shifting roles from games designers to games economists.
Instead of dreaming up new and interesting gameplay opportunities they're poking and prodding the psyche of the consumer, trying to figure out the best way to sell in-game goods and keep you hooked. As the free-to-play business model becomes more prominent, more emphasis will be placed on this area of 'design'.
The effect is made abundantly clear: Most Facebook games are the same style, the same genre and target the same audience because that's what works best for attaining revenue. The platform has become an innovation wasteland.