In my opinion there are only two downsides while visiting Turkey:
a) extremely high gas prices, as you said (even now, your government is taking a big chunk of the cake in taxes), and
b) a sort of 10€ entry fee rule by the Ministry of Tourism. Anywhere you go, no matter the degree of conservation, the existence (or not) of a visitor's center, etc, it will cost 10€ (some worth more than that, others do not justify it).
For all the rest, you just can fall in love with the beautiful and welcoming people/country.