NASCAR '14 is a game that is kind of a hot mess as of right now. There are loads of things wrong with it but there is still stuff that they got right, but as of right now I'd recommend waiting for a Steam sale to pick it up and/if it is patched up.
First, here are some of the things it does wrong:
*Feels like a carbon copy of NASCAR the Game 2013, so if you own that then there really is no big upgrade here.
*Performance issues with some significant frame rate drops (go from 60 FPS to around 10 FPS mainly because it overworks the CPU, if you have an i7 this probably won't be an issue but I noticed that even changing the display settings to low still creates the drop in FPS.)
*The engine noise sounds pretty bad IMO.
*The AI lacks any sort of knowledge whatsoever and drive like they are drunk sometimes.
*The soundtrack is horrible.
*Extremely buggy, ranging from pit stops not doing what you ask (i.e. asking for two right tires and instead gives you four tires), camera turning to the left for a split second randomly, and even places on the track (apron entering turn 1 at Talladega) that cause you to flip your car randomly. Also the points system doesn't really work correctly either, I have drivers who have more points then drivers three positions higher then them.
The main thing they got right was that the tracks really feel nice. The atmosphere of the track itself is really supurb, hearing the chatter from the broadcast into the stands down the frontstretch, the giant television screen on the backstretch at Charlotte showing the camera angle from your car on it, the actual scoring towers actually show the correct position everyone is in, etc.
Even with all of these issues I still find it rather fun to play but it really doesn't do NASCAR justice. If you played any of the previous two/three (since 2013 = Inside Line for PC) then you can skip over this one. I picked it up to basically see how Eutechnyx NASCAR game was since I haven't purchased a NASCAR game since NASCAR '09, and I probably won't again until either Eutechnyx actually makes it right or a new developer works on it from now on.