STTNG - the outlanes and slingshot shape make this game one that I refuse to put quarters into. Pure evil.
TWD - for all of you who are like "my game doesn't drain out of the pops..." Good for you. Every single TWD I have played does. Bad design that again, makes me resolved to not put cash into them on location.
Those two are my main complaints due to the game design being the cause of the drains. Effing quarter thieves these two.