Any guitar can be made to play well. You just need to get it into the hands of a professional who knows how to adjust the action properly. In rare cases, it does not make financial sense to fix a guitar as the cost of repair may be greater than the value of the instrument.
When the seasons change and you turn on the furnace or the air conditioning, it dries or dampens the air in the environment and effects the wood of your instrument. This can cause your guitar to shift and in some cases crack. Invest in a small (de)humidifier that fits in your guitar case to protect the instrument from humidity.
Inexpensive guitars can be adjusted to play well. It just won’t have the sound of a more expensive instrument. As the price increases of an acoustic guitar, you are paying more to get a bigger, fuller, more well-balanced sound.