I just have to post my two bits here. As only a casual NASCAR fan, but a fan of sim games in general I have to write up a little review here. I've played it for a couple hours now and my impressions are quite positive. This game is not for you if you're looking for a racing game along the lines of 2K Drive or Real Racing. As stated before it is more of a racing RPG, with light mini-game integration to supplement the meat of what makes up NASCAR strategy: pitting strategy and car setup. Now to be fair, the car setup is pretty simplistic, basically amounting to trade-offs in upgrade paths, but knowing how to effectively match track types with upgrades for each race is critical to being able to outperform your current status. I actually think the developers have struck a fine balance between a racing sim deep enough to generate hours of fun, but something simple enough to pick up and play a few races and not be bogged down by overly minute details. I'm surprised how much I'm enjoying it to be honest.. It scratches an itch like Grand Prix Story (albeit you are the sole racer) but with a very polished NASCAR experience and look and feel tacked on top.
The one minor negative is the use of timers for upgrades (though they aren't overly obtrusive so far, and relatively realistic as it might take you a race before you get your order for a new engine, etc.)... and the use of a dual currency that allows for sponsor upgrades, etc. But so far, I don't feel like my money is ill spent at all.. It's quite fun and I can see keeping it on my phone for a very long time.